Help needed with this girl thanks?

I have a crush on this reaaaaaallly beautiful girl and we started talking a month and a half ago and in the beginningon facebook she would almost allways start the conversationsbut like this week i had feelings for her and i guess i didnt notic that i was botherin her i was allways talking to her like 4 times a day fr a week and then i sent her a message and a another one and i realised that i went way to far lol (im 15 we have 2000 messages) last message i sent her was thursday night and we havent talk since but she hasnt been online at all ns i saw her today but didnt speak to her i went offline and ten minutes later she was there i went offline came back 10 min later not there so what do you guys think i should do when should i message her or when shes online talk to her or wait for her to talk to me( its her birthday on wednesday). thanks