When a shy girl says "I'm busy"

Tridentus
ok we're both teens, and she's shy.. I think

ive made little moves like holding her hand and stuff which she has responded well to..

and today I asked her out, she was like "yeah sure! ill txt you", like an hour later she texts saying "hey, its me, I'm busy tomorrow, sorry".

what does this mean. I was so sure about this girl, she would always blush when I talked to her, and the signs were good. recently she's been more comfortable around me but mostly bcos I've been talking to her more recently.

she hasn't really dated anyone before. is she really actually busy?
Updates
+1 y
i just don't know what she could be busy with though.. surely she would have explained what she meant by "busy". it's the holidays, and surely she would have said "how about another time?" instead of just "im busy, sorry".
When a shy girl says "I'm busy"
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