I saw this in your other post, and was thinking similar to Misfits4Me....that the vet ought to be more certain about this "Uterus infection" I suppose I can understand if the infection is chronic, or low-grade, but in my estimation it is not worth taking the risk of waiting for it to possibly develop into full-blown Pyometra. Many people have lost otherwise healthy dogs from Pyometra.
The wisest course would be to schedule a spay surgery for her, and remove that uterus, or it could not only prove dangerous, but costly too, as one treatment after another may be tried in order to combat it. During which your dog may feel miserable too.
However...if her white blood cell count is up, the vet would not go ahead with surgery until that came down. So my idea would be to see how she goes on the antibiotics, and then get her blood checked again....and as soon as the WBC count is normal, get her spayed?
I have some recent personal experience with Pyometra. My dog was fine in the end, but it was very worrying at the time, came on very suddenly, and her life was definitely in danger.
Well she and my male got loose and when we found them a few hrs later she was fine the next dday we saw a bump on side of her snout then came on neck the vet has her on CIPIZRO 500g but started her on CHLORAMPHENICOL she was also on her period bleeding heavy. For 2 wks. He checked her white blood cell count it was high but not to high and she stopped bleeding but every now and then she spots. He said it could be an uterus infection but blood cell was not to high so we have to keep and eye on her .
What did the vet say is the cause? Has she had some injury, puncture wound, tooth infection, or ear infection, or something similar?
Lymph nodes swell in response to infection (bacterial or viral), as well as other causes, such as Lymphoma....but more often than not, some infection is the more likely cause.
It is possible either the antibiotics have not "kicked in" yet, or a different, or stronger antibiotic is needed, as she still has fever.
Only if or when antibiotic treatment proves to be having no effect at all, will the vet investigate further possible causes.