I don't know what's the point of deliberating what "the cause" is. Everything that happened contributed to her death, and that's it. If a friend told her to stop medication, then that friend would be sued, too. Are you just try to fit this tragedy into your narrative so you can hang your slogan on it?
And secondly, if you can't see ChatGPT as a simple extension to all the problems "the system" you kept talking about have, then you are blind. AI is a spectre that is haunting this world - a spectre of capitalism.