U dont ,u wait to be invited and if your not invited then u know she dont like u
Personally, I would, and I am a girl. If you are in real doubt, just go ahead and ask! It won't hurt anyone and you'll probably be able to throw a fantastic party.
Ask her where she wants to go to
ask her!
ask her to go out with u
Ask the person that is having the party and see if you can go to there party.
if yount to ask a girl to somewhere just bring some flowers or something and ask her, if she says no it doesn't matter, she'll accept you another day
ask to go out with them
Ask her out
ask her
You ask her out.
ask to go out with them
Just go up and ask her out