What does it mean when you’re having a conversation with a girl and she takes quick glances at you?

deanndish
I was showing my mates sister a feature on the iPhone and whilst I was looking at the phone I could see from the corner of my eye she was taking glances at me. When I looked back up to her she quickly looked at the phone. I’ve caught her before but never thought anything of it.

is this normal?
What does it mean when you’re having a conversation with a girl and she takes quick glances at you?
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