Was she trying to show interest?

So the other day me and my woman friend were at the plasma center to make a couple extra dollars and this girl who I've seen a few times there were behind us and I couldn't help but notice that she kept glancing at me, she might've just been looking at me but she kept looking at me..

It's just funny because I'm assuming she thought my friend was my girlfriend, and she's literally never paid me any mind prior to that. And on top of that her friend kept subtly showing her butt in front of me.. were they both doing this because I was with another woman? I'm single by the way

Was she trying to show interest?
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