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If she stopped taking Paxil suddenly she very well could have psychotic episodes. That's the dirty little secret of psychiatric medications - if you don't come off of them right you can have a reaction that's worse than what made you start taking them in the first place.
You are going to find it's nearly impossible to have her treated against her will because of gross abuses that patients were subject to in the not-so-distant past.
So what's a concerned (and frightened) daughter to do? I like the root of Cary's idea - find the doc who prescribed it and see what s/he can do. Maybe if nothing else he can get her back on it and wean her off properly.
Good luck. What a hard situation.