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1. She definately needs to see a doctor or several. Such a change in behavior can also be caused by a brain tumor. Seriously. I don't mean to be morbid.
2. Do everything everyone says you ought to do, but then after it doesn't work, be ready to step back and take on the burden of living your life. As fun as it might be to involuntarily committ an adult who may very well be a danger to herslef or others, it is really hard to accomplish.
3. Document everything she does, like you would in a nasty divorce. You may need that information for the order of protection you may have to apply for when you fail to committ her, if you know what I mean.
4. It sounds like you had a relationship once and it was good. Cherish those memories. My mother is a schizophrenic AND mean-spirited (just like what that article in the NYTimes yesterday was discussing.) She's lost and I never got to meet the person she was suppose to be. I hope you get her back.