This girl seems interested but doesn't want to hook-up?

SO this girl drops me a lot of signs and stuff that she's interested in me but every time I kinda jokingly bring up hooking up, she acts like she doesn't want to or she says something like "You Wish :P". what's going on with her?
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by hook up I mean make out not sure if that changes anything.
This girl seems interested but doesn't want to hook-up?
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