Seems like some of the nicest people end up with some real jerks.

After a quick search, this is the page that really sums up those first signs and offers some links for help: http://www.ehow.com/how_4808182_sign...ationship.html

I hope your friend is able to reclaim her life and continues to be a kind and compassionate person without being taken advantage of. She is very lucky to have you for a friend.