Is there any reason why girls stare at other girls?

Anonymous
This really bugs me. I'm normal looking (I think), no facial disfigurements and no wart on my nose. I'm not fat by any means, people always comment on my slim figure and yet there is this girl who sits next to me who constantly stares at me.

She looks at my body mostly and eyes me up and down when I walk to my seat. The other day we were both wearing the same jeans and she kept staring at my legs and then back at hers. She also stares at my face too and when I look at her, she quickly looks away.

In the lesson she will stare at me for at least 5 times if not more.

It makes me feel very self-conscious, like she is judging me or my appearance. She has a big build and long brown hair and she is nice when I speak to her, just stares at me a lot

Here's a bit about me:
I'm 5 foot 8
Weigh 130 pounds
Long brown hair
Green eyes
Freckles
Pale complexion

Is there any reason a girl (heterosexual) would constantly stare at another girl?
Is there any reason why girls stare at other girls?
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