Thank you Graham,
Now as she is showing upper GI signs (nausea, anorexia), we should have progressively less feces in her GI to be causing constipation. If there has been suspicion of constipation over this week, I would question whether this was arising alongside her vomiting because something is causing at least a partial obstruction. And this would be highly suspect with her being so young, otherwise seems well (unlike a cat with an bacterial or viral illness), likely mischievous, and when she does eat it sounds like her food isn't getting far before its being vomited back up. Therefore, if she isn't improving an xray would be indicated to let you see what is actually lurking in her gut and potentially causing her troubles.
Further to this, if we have nauseated cats that are vomiting, we do always want to address this. The reason is because cats are not well designed to be off their food (as they can develop secondary fatty liver syndrome) and we always want to get them back to eating as quickly as possible. So, if her vets didn't treat her for this, then this is an angle we'd really want to consider. Now with the degree of nausea she has, it would be ideal for her to be started on injectable anti-vomiting therapy (ie Cerenia, Ondansetron, avoiding Metoclopramide if we suspect a foreign body hiding in her GI). That said, since it is the weekend and she can at least keep water down, I would note that you could consider trying her on an antacid. There are a number of antacids that are available over the counter and pet friendly. I would advise only treating with one, but the two I tend to recommend are Pepcid (More Info/Dose), Omeprazole (More Info/Dose) or Zantac (More Info/Dose). This medication of course shouldn’t be given without consulting your vet if she does have any pre-existing conditions or is on any other medications you didn't mention. Ideally, it should be given about 30 minutes before food to ease her upset stomach.
Once on board, you will want continue to try and see if you can get her eating. Favourite foods are allowed as you have but also consider tempting her with a light/easily digestible diet. Examples of this would be boiled chicken, boiled white fish, scrambled eggs (made with water and not milk), meat baby food (do avoid the ones with garlic powder in the ingredients) or there are also veterinary prescription diets that can be used here (ie Hill’s I/D or Royal Canin’s sensitivity.) You can offer small frequent meals for her (start with a spoonful at a time and give her 30 minute breaks between each to let the previous feed leave her stomach) to discourage further GI upset.
Further to this despite the already long term poor appetite you are combating, with her vomiting you won't be in a position where you can syringe feed (unless we can get her settled with the antacid). That said, I would just note that you can considering offering Hill's A/D (LINK), Royal Canin Recovery (LINK), or Clinicare Canine/Feline Liquid Diet (LINK). All of these are critical care diets that are calorically dense, so a little goes a long way nutrition-wise. And these could just help get some more calories into her even if we can’t get a huge volume of food in. If your vet isn't open to dispense these (though some pet stores may carry the liquid diet) you can try wet kitten food since its more nutrient dense. And since she can drink without issue, the liquid diet or these other diets watered down may sit better with her and allow us to get some food in.
Overall, it does sound like your vets and yourself have been trying to address this GI situation for Mawes. Still with her signs and lack of treatment response, this would be a stage to consider taking the next step diagnostically. Therefore, since she is actively vomiting, anti-vomiting treatment would be prudent here to halt that, settle her stomach, and hopefully help her appetite. Further to this, if she does have an uncomfortable belly, recurrent constipation, and is a mischievous young soul; then an xray would be a prudent means to let you see into her GI and make sure nothing is being missed. Depending on xray findings and supportive anti-vomiting treatment, we will hopefully be able to pinpoint the cause of her signs so that it can be addressed and settled for her before she starts to lose weight or wastes away with this.
I hope this information is helpful.
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