After telling him to do it, she played his death for sympathy. She wanted him dead for her own sake. She is a psychopath, and had obvious malice aforethought.
I’d actually call it worse than giving someone a drug overdose because they asked you to. I don’t think you have an ethical duty to keep someone alive if they don’t care about their own life. But this kid wanted to stop, and she pressured him into it, for what appears to be for her own sake.
The appropriate punishment depends on your punishment philosophy and whether psychopathy can be cured. At the very least, she should be locked up into a mental hospital until she is cured. But, if you assume a cure is impossible, I could also see this be the one time where the deterrent effect of the death penalty would be useful. Psychopaths lack empathy, so you’ve got to make them worried about themselves. The harsher the possible punishment, the more likely we can pressure them into not performing the action. And the death penalty is as harsh as we can go before “cruel and unusual” kicks in. (Some say it goes too far already. I’m still on the fence there, specifically because of psychopaths.)
Now, of course, from a legal standpoint, we won’t get any of that. Our system is just not set up to punish psychopathy but the crimes psychopaths commit. And, like it or not, while she had a lot of power in this situation, it’s not the same amount of power she’d have if she actually caused his death. Yes, depressive thoughts are hard to resist, and the victim was clearly barely hanging on. But there was still the ability, however slight, for him to make his own choice. So we have worse murderers out there that have gotten less of a punishment.
And, actually looking at the law in question, this is just barely hanging on, and there are precedents elsewhere that encouraging someone to commit suicide doesn’t fit the definitions. Under our current laws, this is the best we can do, and it’s far from certain. We’re in America, where freedom of speech is king, and her actual actions were speech. The closest thing we have that is definitely illegal are death threats, which this wasn’t.
I know some people who are very sure she’ll get off. I’m not that sure, but I believe it is a possibility. It would be a miscarriage of justice, as I believe she is a danger to society in her current state, but that’s the U.S. justice system for you.