So sorry to hear about Anna's accident but, happy that she is ok.
I had a dog that got hit by a car many many years ago and I was a wreck with worry. Sounds like you have (and are) doing all the right things for her. What about going potty? My dog couldn't make it up and down the steps to pee so I put newspaper down on top of a plastic table cloth and he finally went on it.
I hope you both can sleep tonight and try not to worry.