WHY WOULD GIRLS DO THIS, EMERGENCY?

There is a girl who I have noticed, we usually see eachother after second period on the staircase, but if we don’t as soon as I come in the classroom (we have two classes), she stares at me. As soon as I come in I sometimes make a silly face to one of my friends and then I usually notice that girl just staring at me and sometimes I smile and she smiles back, what do guys think this means? Is she flirting and why would she be interested if I come in the room and stare at me until I get into my seat? And I have noticed her friends also pay a lot of attention towards me after the first football game when that girl said: dats her and her friend said she is so pretty, I feel like they be just staring at me all the time and whenever we pass by eachother, the stare a little bit and then smile while at the same time I never talked to them ever, does this mean she talks about me to her friends or her friends report what I’m doing to her?
WHY WOULD GIRLS DO THIS, EMERGENCY?
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