I'm really sorry to hear that she's no better.
I'm afraid that I don't know a thing about eye infections. My dog has severe allergies but they don't affect his eyes at all.
I hope he gives you a different medicine for her. Would you ever consider an eye specialist, or a second opinion?
I did cat rescue for a few years and used chamomile tea on some of the cats. It's not going to cure her, but it's soothing. I used a compress and applied when the tea was slightly warm.
Good luck and give her a hug.