Girls, I really have a crush on my neighbours daughter but she is weird around me why?

My neighbours daughter has bumped me with her butt and stood on my shoe. She's also got really excited when she saw me and she's been friendly but then she went really mean and cold and said she hated me. Then she went really shy and turned her back on me and was friendly but she went painfully shy. She's 19.
Now she's friendly and kind of laughs but she's mostly quiet
and doesn't speak much
What's going on? I like her but I don't want to project that into her
She likes you back doesn't know what to do
She's just shy and awkward
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Girls, I really have a crush on my neighbours daughter but she is weird around me why?
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