Why does she only talk to me in real life but mot dms?

I had a big crush on a girl in college and asked her out but she was too drunk to respond.. i caught up w her now and she's taken. She doesn't respond to any friendly dms
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I dmed her and she seemed to just be nice and ignore her feelings.. but she seemed genuine about being just busy.
Why does she only talk to me in real life but mot dms?
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