It sounds to me like she really likes you, explaining the notes and the kissing, and wanting to sleep in the same room as you. The sucking behavior may be comfort-related, although she probably chooses you for it as she's comfortable with you. If she likes you in a sexual way I don't know, or really care. Given that she enjoys giving back rubs but not receiving them, she sounds like a pleaser, someone who enjoys pleasing others. I think it'd be wise to verbally acknowledge her affection, and tell her how much you appreciate it. If you get her to think that certain socially-acceptable forms of intimacy are sufficient for you, then she should stop pursuing other forms of intimacy.