Thanks everyone for your suggestions. My Vet did return my call while I was at work & ended up leaving me a voicemail. He said that since she's improving, I won't need to bring her in until Friday or Saturday. I'd hate to put some other medication in her eye since he directed Gentocin for right now. He might have plans for another drug when he sees her. I do think it's too watery & she really hates that since it runs into her nasal passages. Then she's sniffling & sneezing for a few minutes afterward...and then the hateful looks come out! LOL!
I'll ask him when I take her in about trying an ointment. He said he'd like to give her steroids for the immflammation but if it's an actual ulcer (and not an infection) then it could cause it to be worse.
I'm clueless when it comes to feline drugs & interactions, so I'm putting all my faith into Dr. John at this point.
Thanks again everyone! I'll try to get a picture of it tonight...if she lets me!