Why doesn't she accept the friend request or decline it?

A sent this girl a friend request about two weeks ago and she hasn't accepted although she uses her account by changing pictures. She hasn't declined it too I don't get it why would someone do this. If you remember just accept the request when you are one and if you don't just decline. Should I take back the friend request?
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Please help 😊
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Update?
Why doesn't she accept the friend request or decline it?
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