Girls, when you smile at a guy and then you look down and keep smiling, what are you thinking?

Anonymous
So me and this girl have been talking a lot recently and I have noticed that sometimes we'll be talking and getting a bit flirty (not too much) and I'll flash her a smile and make a joke or offer some help in a project and she'll smile really wide, then look down and just give me one word answers like "ok" and "i guess" or "fine". Now this girl is well spoken and we have a great time talking about all kinds of stuff, but I think its funny (and cute) how her vocabulary gets impaired when I make her smile, so I would like to know, what usually goes through your head at times like that?
Girls, when you smile at a guy and then you look down and keep smiling, what are you thinking?
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