It mean she was throwing paper at you in a dream.. :)
dreams are usually associated with "recent events mixed in with events of the past" or with wish fulfillment. Some have very little meaning or relevance others may be significant. It's best to pursue this like-love me possibility while she is awake and just let her know (carefully) how you feel.
That's why I said, carefully. I don't know you or her, but if it were me I'd say something like, "You're dream makes me think what it would be like if besides just good friend I was your boyfriend." Kind of lame, I know, but I would do something like that if I felt that I loved the girl.
Meaning: if you get any closer you will likely marry and after a short time DIVORCE papers will be thrown at you????