Why doesn't she greet me anymore? Is it my turn?

She used to greet me me everytime she first saw me with a hello, and I feel like we have started talking more and becoming friends. Well recently she no longer does it. It makes me a little worried. Is this normal? Does she want me to do it? I have been kind of relying on her to start the conversations until this point.
Why doesn't she greet me anymore? Is it my turn?
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