Why does this girl do this?

Whenever im doing a project with this girl, She treats me the worst outta all the guys. She'll be friendly with EVERY GUY cept me and she teases me. She sometimes crosses her legs she'll brush them up against mine for like 2-3 seconds, move her legs and touch my legs again, Whenver she reaches she always has to have her arm touch mine, and once again it will be for extended periods. whenver we look at each other, i noticed her eyes are usually dilated and she ends up smirking and looking down. When we sit next to each other i've noticed that she always is messing around with her hair even when we aren't talking, she'll be playing with it, i personally think she is nervous, but why i have no idea... She doesn't seem nervous around other people only me?