I was at another hall at that time, and one of my friends ran to go find me...she found me and i won the money, and i was so happy....
My mom said I should give 50% to my friend...what do you think?
You know i was thinking that, but she's really only a classmate...i might have talked to her like three times in the last two years....
Funny, when she was of benefit to you she was a "friend" and now that you are in a position of repaying her kindness, she's suddenly "only a classmate."
I think it's pretty clear that you will do whatever you want to do, which is to give her $0. So why even bother asking?