Girl I like, but unlikely to see her over summer

Ok so I'm 17, just finished AS levels and broken up for summer. There's a girl I like that I started talking to a bit in the last couple of weeks of term. Would like to see her again but with school finished for 6 weeks I think it's unlikely. I don't have her number and a Facebook message would probably be a bit cringey. Do I wait until school starts again, or say something, the only time I might see her if I don't intervene is results day....

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