What is she going to think (girls please help)?

Well its a little too late since you already posted it but if i were you i wouldn't worry. She already seems like she's into you esp. since she said she missed you. It's not like you blurted out "I love you!" to the girl. She probably log on and see it and it'll make her day. you seem really sweet. If she freaks out, something's wrong with her, not you.