Girls, Why the girl I like always looks down and starts playing with her hands while keep looking down, whenever she faced me, she did the same thing?

It took me 5 months to observe her character and everything else about her and I finally fell in love with her and now whenever she comes to my shop she sits down and keep looking down starts playing with her hands and she didn't even talk to me even once.
Girls, Why the girl I like always looks down and starts playing with her hands while keep looking down, whenever she faced me, she did the same thing?
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