Pandora- I would definitely ask about being able to give her oral prednisone. I would stray away from the drops as we (I say "we" as in at every vet clinic I've ever worked as a tech at) are very hesitant about putting any kind of drops in the eye of a bad injury (except for antibiotic drops), depending on the severity of the injury it can sometimes be done.
I understand how hard it is for you to hear her yelp... just remember you're doing what's best for her in the long run. I can relate, sorta... not exactly the same thing, but in a research lab I used to work in, doing cool stuff with DNA (making robots out of it- it was sorta neat), we had a super high power (read: dangerous) UV box. I was always SUPER careful in the lab. But one day, I somehow forgot to put the shield down on my face mask. I was wearing it, but the shield wasn't down. I was staring straight into the UV light for over 10 minutes before I realized it. Lost my vision completely for two weeks, I was greatful it came back. Seriously one of the most painful things I've experienced. And I had to put these antibiotic drops in my eyes, and was on percocet, and I think something else... ant it HURT, but I had severe burns on my cornea, and I new it had to be done if I wanted to see again.
I've seen dogs with horrible rips in the cornea that miraculously recovered beyond odds, so it is possible. It is just one eye too, correct? So worst case scenario, she may lose sight in the eye, yes, but she is lucky to have such a caring mommy, and I promise you she won't take long to adapt- especially if she's still a pup. I myself have cared for dogs that were either partially or completely blind in one or both eyes, and it's amazing how well and how quickly they adapt to it.