Well there is a few ways. Leave her a note. Catch her when she is alone (not when she is sad). Or call her.
Just how you get a date with any other girl-ask her out.
ask her to go out with u
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ask her!
You ask her out.
ask Her on a date
you ask her?...Or you ask her best friend if she likes you and is she allowed to date.
ask her on a date
If you can date, ask her out.
Ask her out.
On the date? Ask her about herself.
Ask her out on a date.