Why she playing with me or?

On Wednesday, there was this girl that initiated conversation with me, I was walking on her direction and she told me ”bye” while waving at me and she looked smitten, then yesterday (On Friday) I tried to talk to her (she was talking to her friend at the same time) and she didn’t seems as keen as Wednesday like her answers were shorts, was she only friendly or she likes me?

Why she playing with me or?
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