Dear all, thank you for your replies.. Especially Treevoice, your thoughts are exactly what I have been thinking about and what's stopping me from making a conversation with her. Sometimes I think I should tell her "please find someone to love you and support you, but it can't be me".
I am really confused, because there are two types of writings about depressed persons, possibly borderlines, ACOAs, etc, which she all has traits of - first type of posts is like "run away like hell" and the other type is "they need help, love and support".. I feel sorry for her, she's a good girl, crying out for help, at the best way she knows, which is not a healthy way, but what else could you expect from and ACOA?
I don't want to be in a relationship with her now, I know I couldn't and I know I would treat her very badly. In the future, who knows, but it would include a lot of work, etc... I am just wondering should I tell her what I honestly think, because that's bothering me a lot, and I can't stop thinking about it.