Girls, Why is she deliberately delaying a reply to my message?

Like I send her a message and she is online but responds hours later. But she always responds to me. Like in person she smiles at me, we talk, my mate saw her leaning in towards me when we were chatting once. She seems somewhat nervous around me suddenly. I added her on Facebook and she took 24hours to accept it. She offered to help me a few times with some tasks. What the hell is going on?
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1 y
She does reply in less than an hour sometimes too
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