Girl fake laughing around me?

I've noticed this girl at the gym will go up and talk to dudes when I am in her area. When I walk closer by them to but the weights back, she does the obnoxious fake laugh. I can tell its fake because its overly loud and unnatural. I've also noticed she only goes up to and talks to these dudes when I am around. When I am across the gym she stays with her earphones in and doesn't talk to anyone.

Its to the point I can predict it everytime. Yesterday me and another guy were at the free weight section. She was across the gym but I saw her staring in my area mulitple times. I thought to myself " I bet she's gonna come strike up a conversation with this guy next to me" Sure enough she did. This happenes all the time along with the fake laugh. Thoughts?

Girl fake laughing around me?
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