If a girl says thank you for asking her out and then rejects you ( says she has a boyfriend) does this mean she did not find me attractive at all?

This was just an off the street ask out.
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+1 y
well she said she had a boyfriend and then said "thank you though". I was just wondering if a girl says " thank you " at any point in that situation, does it mean she does not see you as a potential boyfriend.
If a girl says thank you for asking her out and then rejects you ( says she has a boyfriend) does this mean she did not find me attractive at all?
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