Why do other women do this?

When I was in washroom fixing myself ( I didn't have make up on, a girl comes out from stall, ( she was looking at me when she closed door) she comes out puckering her lips at herself in mirror and looks at me kinda a weirdsnile. Was she trying to stand me up? Am I not allowed to look at myself without a girl thinking it's competition time?

Why do other women do this?
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