How to ask a girl out on Facebook?

[Pestychannel954]

I know this girl from school, I have talked to her a bit at school and it is Christmas holidays now, and I am talking to her on Facebook, She seems to like me a bit, I don't have her number, and her phone is broken, I am not very good looking, and she is thought of the most beautiful girl in the year.

Can't ask her in person at the moment, because:
1) We are on Christmas Holidays
2) I am too nervous, even asking on facebook (pathetic I know)
We are both in year 11, and she said that she is not taking anytime off revision for mocks, could I say , "Anyway, tell me if you change your mind about going out anywhere this Holidays?2