When a family member is over 18 there is not much you can do, until they do something illegal.
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We committed my mother 5 times in 15 years. I can assure you she was over 18.
It’s hard, damn hard, but if you care enough, you do it.
I am sorry to hear of your troubles. But I do know of what you speak and yes, it is damn hard. For anyone that is successful, how many do you think are not? Just the ones that don’t “care enough”. I just don’t feel that’s a fair assumption. It sounds like her family was trying. Good to remember that not everyone is as smart as you.