Why does she act differently around me?

naked-singularity
Hi,

I have been crushing on this girl for some time, and I notice that she acts differently around me than with everyone else. She seems to clam up when I'm around, and I don't know what to think. Normally when I talk to her she will smile and make eye contact and give me her attention, but she almost never laughs at my jokes or engages in teasing with me (which I'm told are very important.) I'll give an example.

The other night, me, her and a bunch of friends were playing cards and talking. She would act very sociable and friendly to everyone at the table but me. She would laugh at all of their jokes but not mine. She did try to get close to me on a number of occasions, close enough for me to smell her perfume and such. We were playing a card game where we have to drop a card in our hand on to the table, and then have someone else pick it up (I forget what the name of the game was.) One time I was deciding which card to drop when she reached over and plucked the card out of my hand, and then looked at me and gave me a big smile.

I don't know, I get a lot of good body language vibes from her normally, but why won't she laugh or engage in teasing? Girls, your advice would be most appreciated.
Why does she act differently around me?
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