Is it ok to ask a random girl to prom? How should I ask her as well?

tremo2016
There is this girl in my gym class and we are both seniors. I have talked to her like a few times this year because she was on my volleyball team in gym class. Im pretty sure she knows my name and who I am, so would it be weird to ask her to go to prom like casually? By casual I mean just having fun and not getting intimate. I just want to bring her like I would a friend. Is that ok? How should I go about approaching her? Also I am not sure if she has a date or not so how should I ask her if she does? All answers would be very much appreciated
Updates
+1 y
by the way I asked the girl this Wednesday and she said she is not going to prom she will be on vacation during that weekend. But good news is a found another girl to ask and I got a prom date :)
Is it ok to ask a random girl to prom? How should I ask her as well?
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