Ok so a very minimum treatment for an active infection would be 2 weeks, with 3 weeks being better.
The 4th vet seems most promising, depending on the age of your girl. The younger the better for spays as the older they are the more likely they already possibly have tiny mammary tumours already growing.
The malocclusion issue almost sounds like they cracked a tooth root and it abscessed? Did they clip or burr the teeth when you had her done? Was she awake or lightly anesthetized?
Dolly (the girl with a mammary lump being removed on Tuesday) is only nine months old which is why I thought she might make a good candidate for spaying but to be honest, I'm so glad I've finally found a vet to agree to at least take the lump off in the first place. It's been growing so fast and three vets have already turned me away so I'm thinking at least I can have it removed and see what happens. It gives me a little time to keep searching for a vet that will spay if that is a possibility. This was her just a couple of months ago. She practically a baby still.
Penny (the girl that had the abscess) was anesthetized and a burr was used.
Most of the infections i've been prescribed Baytril for were URI's and I was given between 4 doses and a weeks worth of doses for different rats at different points. I also had a rescue girl who had lived alone her whole life and had some difficulty socializing with the group I introduced her to at first. She got a nasty cut on her stomach which quickly became infected. I was given five doses of baytril for that but luckily they also gave me an antiseptic honey topical treatment which must have been just the trick because after keeping it clean and treating it with that, the infection cleared and she healed up fine. That's her at the bottom of the pile. It's so lovely to see her as a happy part of the mischief. She was genuinely depressed when i got her, after eighteen months on her own. She just sort of led there despondently. Now she's active and social so I'm thrilled the honey treatment worked for her.
And then, since I seem to be on a picture sharing rampage; here's Jarvis (my 620g boy):
He was rehomed for 'aggression'. Apparently he left serious bite marks on the children at his previous home. He's not actually aggressive at all, though. He had part of a toe missing and felt tip pen on his tail when I got him. He used to scream if I got too close to his face as well when I was stroking him. I think it was a case of the children being rough with him and being left unsupervised because he was a really frightened boy when I got him but I just responded to his body language (e.g. giving him space when he puffed up or squeaked at me) and now he's a very happy, cuddly boy. When I get him out to play in my room he'll enjoy himself with his cagemate for a bit and then come and snuggle on my bed with me.
Sorry for the unwarranted introduction to some of my rats. I just love them so much aha.