My chin can't eat. I need help!

Hi! My chinchilla Chila fell yesterday and since then she can't eat anymore and she is lethargic. She takes the food in her hands and she tries to bite it but she can't.

Today i took her to the vet and he looked at her mouth and didn't find anything wrong with it and he gave her an anti inflammatory injection. He also said that she might be scared because of the fall.

Chila doesn't feel any better and she doesn't drink water. I crushed a biscuit for chinchillas and she ate it from my...

My chin can't eat. I need help!