Honestly, everything you’re mentioning is pointing towards either Magic Kingdom or Seaworld. I’m also going to disagree with everyone on Animal Kingdom.
Before I rant: Feel free to PM if you want more info or have specific questions. I’m no Len, but I do live in Orlando, have annual passes to all the parks and go, quite literally, every weekend. So I would say I’m about as close to an expert as you can get. Just sayin’ =).
MK: This will have the rides that your wife is most tolerant of. Thrill rides are basically just Space Mountain, Splash Mountain, Big Thunder Mountain (basically avoid mountains!) and Mine Train. Other than that, there isn’t anything that isn’t just a light and easy ride. Haunted Mansion and Little Mermaid use the same basic ride structure (a 3 person, slow moving tram on a track), Peter Pan uses the aerial boats (but heights definitely isn’t a factor), Small World is a “boat on a rubber track” ride. People Mover, the actual train, Laugh Factory…all of these are easy-peasy “look at what’s around me and not the actual ride” rides.
Animal Kingdom is fine and all, but if she’s weird towards animals, there isn’t anything else to do. She won’t go on the river rapids ride nor Everest, nor Dinosaur. The safari will be fine, but the rest of it is a typical (if not good) zoo. The shows aren’t even anything to be proud of.
Epcot would be OK, but again, boring. Nemo is easy tio ride (it’s set up like Little Mermaid), so is the Donald Mexico ride and the Frozen ride (both are on a boat, but are more akin to Small World). Soarin is a maybe, Test Track is a no. Other than that it’s just circling the countries and…well…that’s about it.
Seaworld is good because I still enjoy the shows and like the animals. They aren’t getting rid of the Killer Whale show for another few years and the Dolphin show, the Sea Lion show and the pet show (my fave!) aren’t going anywhere. They have a cute little penguin ride that she could do and at the end you get hella close to penguins. Skip the coasters. They do have a log flume ride too, but it’s short. Feeding a sealion is pretty fun for 5 bucks and they have a dolphin encounter for, I think, 15. You can pet it and feed it and tell it to do tricks and stuff.
Completely skip Universal. Citywalk has good food, but the park is a no-go.
TL;DR: Magic Kingdom is your best bet, followed by Seaworld.