You just started the first treatment today. I would think it will take a few days until you see any improvements. If you are concerned though you should just give the vet a call and just explain to them what you did here and see what they say about her eye.
If the vet recommends keeping her away from the others I would take that advice. You don't want to chance the other kitties getting whatever infection she has.
If the vet recommends keeping her away from the others I would take that advice. You don't want to chance the other kitties getting whatever infection she has.