Ok - that respiratory rate is VERY high! A normal cat respiratory rate at rest is about 20 breaths per minute.
What this suggests to me is that your cat is NOT clearing the fluids adequately from her body and now has fluid in her lungs. This makes it hard to get oxygen across her lungs which then means she has to breath very rapidly in short, shallow breaths.PLEASE STOP THE FLUIDS!
I never give more than 250mLs in a 24 hour period to a cat, and usually build up to that slowly over a period of weeks. I monitor that the cat is urinating and that she is not developing dyspnea (difficulty breathing) or tachypnea (rapid breathing).
If your cat does not seem to be in respiratory distress (open mouth breathing, struggling to breathe), you may be able to wait this out over the next 12 to 24 hours, while her kidneys deal with the fluids.
It is, as you have guessed, worrying that she has not urinated as much as one would expect.
This does not mean that she won't... but the next 24 hours are critical!Please watch her breathing very closely. If she is breathing more rapidly, or has difficulty breathing, then see your vet immediately. If she is not urinating in the next 12 hours, then see your vet.
Stop the fluids for now, while her body deals with what is in there. I am hoping that her kidneys will start to push this through soon. If they do not, she may need injections of a diuretic like lasix (furosemide) in order to get the fluids out of her lungs.
Normally, a cat on SQ fluids will urinate twice a day or more. She may be feeling weak, so do make sure her litter box is close by as she may not have the energy to reach it.
I hope that she starts producing urine very soon!
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.
Best wishes, Fiona