Thank all of you for your responses. When I showed my wife about this post, her mouth was agape for a while, yet she offered no other solutions. I'ts a hard thing.
Sigh. I really hate to go that route and would be lying if I said I hadn't thought about it. I've looked into restraining orders and they are geared for prevention of violence; which may be exactly what could happen.
I would prefer to commit her to a state supported institution...I've looked...
I have a 24 year old stepdaughter. She lives with her mother and I. Her mother and I are at the end of our ideas. We want to throw her out of our house, but do not knnow how to go about it legally. We give her money, and she throws it away on 'I don't know what'. We got her a car, but she cannot...