What does it mean when a girl blushes when you call her 'pretty' or 'beautiful?'

Anonymous
A bit of a silly question, I know, but should I take this as a sign that she has a crush or not? The first time she she also stared at the floor and said 'you're so sweet...' if that's worth anything. Since then she has just gone red, lol.

Is it likely that she was just embarrassed and that I shouldn't look in to it?
What does it mean when a girl blushes when you call her 'pretty' or 'beautiful?'
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