If it were me chick and one of my buns had poorly eyes and the vet said it could be mites id be hot footing it out of there and finding another vet asap, that poor buns eyes are way too bad to be left, i wouldnt give her anything for mites until she is better she obviously has a very low immune system at the moment and adding mite stuff isnt going to help, she needs pain relief, buns hide pain well until its too late.
please book in to see a vet today a decent one, the sooner she starts treatment the sooner she can get well again. xxxx