What should I say to her?

Start talking to her on Facebook every once and awhile . Like when you see her online send he a IM and start a conversation . Don't do it everytime she's on cuz she might start to think ur creepy . Jus every other time . And you can start to get to know each other more throughout the summer . And maybe after awhile you can get her number and star texting her. Then when school comes around you might know each other so well your not afraid to talk to her .