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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. I'm sorry to hear about your girl's situation. Is she having any vomiting? Is she breathing harder than normal? Is she having normal stools? Has anything really changed in the environment that could be stressing her out?
Do you feel that she's eating and drinking normally? Could there be things that are spooking her in the environment such as decorations around the house, Christmas lights, or new sounds?
Is she eating and drinking some? Is she still using the liter box? Do you feel she's losing weight?
That is good that there is no obvious weight loss and that she's still eating and drinking some. As far as her behavior, is this due to something behavioral / environmental? Is it because of some physical issue with her body? There in is the unknown. It is always my recommendation in these cases to have veterinary visit done to have a physical exam performed and then based on that any blood work / testing that seems needed. This screening is looking for any possible physical issue at hand that may be tied to all this. IF there is an underlying issue, then it needs to be directly addressed / treated. Could this all be environmental / behavioral? That is the suspicion when physical exam findings and testing aren't revealing anything. In behavioral cases similar to this, using an environmental calming product like Feliway can help reduce stress. This product is a feline specific calming pheromone that can be used as a diffuser that is plugged into an outlet. For some, it can help to reduce stress and improve their situation. The only way to know if it will help is through a trial of using it. Here is a link on it.
If there are new cats introduced into the house, that may be something that is stressing her out.
That is good that you had her at the vet's office there seven days ago. If she has recently had a heat cycle and is acting like this, then the consideration arises as to a possible infection in her uterus called a pyometra. This sometimes is very obvious with purulent vaginal discharge. Other times it may not be as obvious as the cervix is closed and no drainage is present. Getting an abdominal ultrasound in these cases is usually the most definitive way to diagnose this.