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I'd be most concerned that she isn't eating due to pain from the accidental trauma this morning. Is she still urinating and defecating? - Dr. C
In a kitten that young, I'd worry that she will develop hypoglycemia (low blood sugar) due to not eating. Do you have any karo syrup at home? If so, you can give her a small amount orally (0.2 ml) every 2 hours to keep her blood sugar up until you can get her to your vet in the morning. That may get her feeling better enough to eat for you, but she is going to get very dehydrated very quickly if she doesn't start eating for you- I'm guessing that you are still feeding her kitten replacement milk since she's only 3-4 weeks?