Why is she listening and answering our conversations?

Me and this one girl have a lot of mutual friends. I don’t normally talk to her irl because I don’t often see her, but I do snap her multiple times a day. Today we were both with our mutual friend at a football game. She was standing in front of us. It was very loud and I was basically talking into his ear but she was answering every question before he could respond. She was even looking the opposite direction while listening. Why?

Why is she listening and answering our conversations?
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