Why does my date go quiet when I compliment her?

She goes quiet for a few seconds and does not respond and I could tell she feels awkward about it. I even asked her “are you shocked?”

this is a girl who I know likes me because she has told me that and that she has never met a man like me. I just want to know why she goes quiet whenever I compliment her looks or personality?
Why does my date go quiet when I compliment her?
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