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I've seen this happen before at a show. Try and keep her calm now and offer soft foods overnight. She may have bruised the nose or inside her mouth. The blood is often because they bite their tongue in the panic. I'd try and see a vet in the morning to trim the teeth even. They should grow in again as long as there is no root damage. Most vets are open Sat morning. Don't leave it till the holiday weekend if you feel she is in pain as that will be very pricey! She may get away with some metacalm for the pain. It's important to keep her eating so anything she will take for now. Hope she is OK starry.