Girl is acting childish, what's up with that?

So I like this girl at my work I asked her to hangout like a month ago she said she was busy and that was it we still talk at work and stuff but today she was normal in the morning and later on that day it was just me and her and she was like acting not crazy but like I guess just really excited we were like laughing the whole time and joking around

I was just wondering does that mean anything like could I still have a chance with her?
Girl is acting childish, what's up with that?
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