Mother suddenly rejecting 3 week old kit!

Our female chinchilla has become extremely violent towards everything and everyone. We think she is hurt in some way but we can't be sure how until Friday when we can take her to a vet. She is attacking her 19 day old kit and rejecting him totally. The father chin had to be separated an hour before birth and has not been able to be reintroduced successfully at all because she attacks him too. She is sweet and has never done anything like this. Does anyone have any ideas for things we can do until I can get her to a vet? How do I feed the baby? The poor kit is now terrified of the father as well.