Is she ignoring me because she knows I like her?

So around when she first found out she has smiled at me and was really friendly. She would always listen to what I said even if I didn't directly talk to her. I won't get into too much detail but lately she hasn't talked much to me. Or maybe I should say she doesn't really make eye contact with me a lot. Now when I say hi she'll kinda look down and many times we talk she'll not look. Although just recently at a church activity she was busy putting stuff away, and I kinda tried to talk to her but she gave short answers and walked away not looking at me. I don't know of its because she's avoiding me or she isn't interested at all. But then I walked into the kitchen to put something away and she walked with me looking for something and stayed a bit with me an we talked. She clearly didn't seem to avoid me but when we talk she hasn't been as responsive as before. Did I probably do something or is she just not interested? How could I get something going if this is true?
Is she ignoring me because she knows I like her?
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