Hi again, and thanks very much for your helpful reply.
I'm so sorry she's not acting herself. If she is usually a very vocal and loving cat and those behaviors have changed, plus, she's not eating, this could
be related to getting the new kitten, because even though she can't see him (and you're doing just what you're supposed to do in a new introduction situation--keeping him isolated at first) she can smell his scent and this can be upsetting to her. She may feel depressed, anxious, and that 'her' territory and 'her' humans are being taken away. However, it could also be coincidental that she started not feeling well due to an underlying medical condition at the same time you acquired the new kitten.
Try some Feliway, a cat appeasing pheromone which calms stressed cats. You can find it at any pet supply store or order online; it comes in a spray and plug in diffuser which resembles an air freshener, but has no perfumy scent. Here is more info: Feliway
If she was give an IV at the vet, I assume this was fluids, because she was dehydrated? That would mean she's not drinking enough on her own. Ingestion of a toxic substance is always a possibility, but other medical conditions like diabetes, liver and kidney issues, just to name a few, are also possible. To check for any medical conditions, she would need a complete blood work-up from the vet. The results of this will provide more diagnostic tools. A urinalysis should be run, also, to check for anything unusual.
If she's laying around with her paws pulled under her (I call that the 'loaf' position, because it looks like a meatloaf shape), sometimes, this can be the indication of a symptom of discomfort or pain. I'm assuming the vet palpated her abdomen for any bladder or intestinal issues.
If she is not interested in eating anything, you're going to have to force feed her. This isn't as bad as it sounds. You take a dropper or children's/pet medicine syringe and fill it will either smooth watered down cat food or plain jarred baby food containing no onion product or any seasonings, place just the tip in the side of her mouth where there is an opening between the upper and lower teeth and squeeze in a little at a time. Wait for a swallow and continue. You can encourage the swallow reflex by gently rubbing her throat. If there are two of you, wrap her in a big towel so only her head is out and one can hold and one can feed. You can give her 2 droppersful (2cc's) every 20 minutes for an hour, then repeat in 2 hours. You can do the same with fluids, if she's not drinking on her own. Mix children's clear, unflavored Pedialyte 50/50 with water and dropper feed her this in the off hours in between the food feedings. Speak gently to her while you do this, to keep her calm.
You can also try Cat Sure which is like Ensure for humans. It provides essential nutrients for cats who are not eating properly. See if she'll lap it. Also try Cat Milk and Nutri-Cal, a nutritional supplement for calories and energy which comes in a tube. She can lick it off your finger.
So, your next step should be to ask the vet to run bloodwork and a urinalysis to check for underlying medical issues which might be causing her present state, and take it from there.
I hope all will be well with your furry girl!
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