I agree with cocoabeans. It's good to be concerned and good to educate yourself, just in case. But don't try to diagnose. And do encourage her to seek help. That's kind of hard to do, I know. Maybe ask how she's feeling and let her know you're concerned about her.

I know when I was having that episode of psychosis I believed it 100% and I dont' think I would have believed I was wrong. I might have even been mad if someone told me it was "crazy" or whatever. But, and this is a huge but, now when I look back I see all these people that I told and no one did a thing. It makes me angry and furious. But if someone had said something or done something, even just let me know they were worried and cared... I would be very grateful to that person.