Why would a girl try and get me to guess this?

We were having a conversation in class and somehow we were discussing birthdays. She asked when mine was, I told her and asked when hers was. She didn't tell me directly, and told me to guess instead with a smile on her face and made me keep guessing every number in the month. Why would she do this? Does it mean anything or is it just playful?

Why would a girl try and get me to guess this?
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