Why did this one women giggle when I gave her a compliment?

If i find something attractive a bout a women i wil let them know. this one women walked into the office and i compimented her saying she looks nice today she said "oh! thanks" in a surprised way then giggled afterwards.

I am just curious why a person will giggle after a compliment?
Why did this one women giggle when I gave her a compliment?
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