Wait, I'm sorry bout this but the way you worded your post was slightly hard to understand cause you were missing words. So if I read your post right, your friend moved to your high school, your in the last year, she asked you out before but you never said yes, and you think she likes you like you like her..
Well, The cards are already set out from what I can see.. It's question time

Just have a good time with her, like a talk or something.. Let her know you wanna be with her and she will say yes if she does want to be with you.
Good luck man!