Why is she been all chatty with me and iniating conversation with me in person?

I do like her and I've noticed she has been starting conversation with me in person. We don't know each other that well. She is literally someone who I see at a coffee shop like once a week. She did accept my friend request on facebook after I discovered she was friends with my cousin.
I don't know if she is just been friendly or she likes me?

She literally just started acting overly excited to see me when I was a complete stranger who barely spoke to her. Now we just naturally started getting closer and talking
Why is she been all chatty with me and iniating conversation with me in person?
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