Why does my friend keep rolling her eyes at me?

Did I say something wrong? My friend keeps rolling her eyes at me in conversation. The last time, we were getting ready to go out and she said "it's so lucky, we're both really pretty girls." and I said "yes you're beautiful" and she said thanks and rolled her eyes at me. I don't know why, but she keeps rolling her eyes at me in conversation and I don't think I said anything wrong. Why do people roll their eyes at their friends?

Why does my friend keep rolling her eyes at me?
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