The problem with this premise is that there’s not much information about the (ultimately successful) adventure in which Emma and I played important (if not key) roles. Forgive me Skald if I’m off-base, but I’m going to read into this story a couple background assumptions.
I) To keep Pangea operating correctly (or make things right again) Pallas needed to reach over and grab a couple humans to play specific roles in the team (or maybe the whole team is just Emma and me) that is key to the adventure.
A) My assumption is that humans were needed for something related to their technological expertise[1] and/or physical attributes[2] and/or special knowledge or mentality[3].
1] The OP states Pangea’s tech is better than Earth’s, but maybe the task is like fixing a malfunctioning DOS 5.1 computer or trebuchet – something their tech has surpassed but the malfunctioning of an old unit threatens to destabilize…whatever.
2] Perhaps Pangea’s typical humanoids have only three fingers and a thumb on each hand and whatever’s broken requires 10 digits to manipulate. Or humans see/smell/hear/feel in a different spectrum and can detect something the Pangeans can’t sense.
3] Maybe the fact that I’m a martial-artist AND I’ve watched a ton of Jackie Chan movies gives me a knack for turning just about anything into a deadly weapon so that, when we’re imprisoned, I’m a lot more capable than our weapon-or-magic dependent captors expected. So after taking away our wands and crossbows and tying us to chairs beneath their doomsday device and explaining how it will work, they figured we’d just be helpless without those weapons…
B) My assumption is that the abuse Emma suffered isn’t just incidental to the story but a key plot point – she’s kinda like Tommy the Pinball Wizard, and whatever she’s done to cope with the abuse is what makes her The Perfect Choice for the role she needs to play on the protagonist team. For instance, unlike normal beings, Emma learned at an early age to endure atrocities directed against her and disassociate herself from the abuse. This enabled her to maintain her innocence, sanity, etcetera which were required in order to be able to qualify for some magical or divine test.
So, Emma and I call them quirks, the readers see them as strengths, and the author calls them plot premises. Literature analysts, if they bother to examine this tale, will call them romantic devices – the special attributes that gives the protagonist(s) the advantage that gets the job done.
II) As the tale unfolds, key characters must grow and change. It’s called character development and sometimes it’s even about building character. 
Maybe Emma will learn to stop fearing/hating/distrusting men/adults like me (and maybe that’s my only role in the tale). Maybe I learn to stop fearing/hating/distrusting kids like Emma (doubtful, but this is a work of fiction, after all). Maybe I learn to believe in unicorns and regain my lost innocence; maybe something helps Emma regain hers. Maybe Emma comes to realize she’s important as more than just a punching bag (and worse) and doesn’t need to be anyone’s victim any more. I think this is a more critical point for this thread than the assumptions in Part I: How have Emma and I grown?
Understanding how Emma has grown (if at all) determines my advice to the Prophet. If Emma has grown in ways that will help her cope with the situation(s) she left behind, then I’ll recommend she be sent back to do so. These types of stories tend to have an epilogue that involves the troubled protagonist taking the developments of her character and applying them to the difficulties she knew before she learned Pangea existed. We readers tend to assume the developed character will successfully apply the new growth to the issues left behind, even if that chapter remains unavailable for us to read. If Emma’s growth and new worldview would cause her long-term problems back on Earth, I would recommend she stay on Pangea – whether or not she associates in any way with Aredhel – so long as there are locals who are willing to help Emma get integrated into Pangean society/culture. After all, it may be that the character growth she has experienced occurred to help her cope with life on Pangea rather than with the issues she left behind. [Maybe her destiny is to eventually become a Prophet, or Pangea’s next itinerant hero like Xena or Conan.]
The Aredhel situation is a separate issue entirely. A key question is whether Pangea’s (or at least Aredhel’s culture’s) belief system and/or understanding of reality includes reincarnation. Since Emma and I didn’t go insane upon finding ourselves in another universe, I’m betting we’re mentally flexible enough to believe in reincarnation if it’s commonplace on Pangea. Delayed Cross-Universe Reincarnation isn’t much more of a mental leap. If DCUR is considered demonic or impossible or miraculously rare, then Aredhel should be directed to whatever passes for mental health treatment (bereavement therapy) on Pangea, rather than let Aredhel assume Emma is a replacement daughter brought by Pallas in answer to Aredhel’s worshipful prayers. [If Pallas wants to step forward and say, “Yeah, I did that (for whatever reason)” then the premise against worship of the gods is broken at that point.]
I realize I haven’t been offered the chance to stay. I do appreciate the repair of my little quirks (and hope the readers saw them as entertaining foils as the story unfolded). Nevertheless, I’ll offer my services as a cultural advisor. At the very least, I’d recommend some kind of inter-universe voice-mail receiving/transmitting device be given to me (or implanted) so I can answer any questions that arise in relation to Emma’s long-term acculturation on Pangea or reacculturation on Earth. [“Yeah, human teenagers tend to do that. Give me a couple days and I’ll get you some literature about electric guitars…”]
Then there’s Emma’s mother and other abusers. Unless my character development (see II above) included a realization that even bullies have their positive roles in the universe(s) and therefore shouldn’t be annihilated on sight (doubtful, but this is a work of fiction, after all) then I would like to make a special request that Pallas, who is able to do some amazing things in many universes, either
A) Give me the knowledge of where those people are and the ability to conceal just a few nonspectacular homicides – a few potions of invisibility should do it, as long as I know where their favorite restaurants are…:dubious:
or
B) Pluck those abusers from Earth and deposit them…well, somewhere horrific and/or inhospitable so they can spend their remaining years suffering each day at least twice as much as they made Emma suffer. Perhaps send them to a Pangean equivalent of Mercury or that kind of thing.
—G!
