Camomile will do little to calm a dog that is fearful of fireworks. You are better keeping her in a leash attached to a harness and walking her out for short trips to release herself.
Every year dozens of dogs are lost when they run away due to fireworks – some are never found again so be very careful when she is outside.
Putting her in a crate in a darkened room where she is less likely to hear the noise is also a good idea.
Try a thunder shirt or similar product to help her in the future.
A washcloth with warm soapy water should be used to clean the wound. Some diseases are transmitted by mice and could be problematic please contact your vet.