Hi there- there may be an underlying issue that is unknown or unrealized to you that is causing this change in behavior. So that might be worth investigating. As far as keeping them separated in your studio- have you tried to make places where they can “escape” to? For instance, we used to have a cat that was very sociable, but when she needed her alone time she would go up on the window sill of our basement window (high up) where no one else could bother her. When the cat we currently have needs a break from the dogs, she goes on the shelf in our closet where she can be alone. Maybe a cat tree or a high shelf might be helpful? ????????
I wouldn’t force feed without vet guidance. I would, however, call your regular vet and have a serious conversation about what you can do for her, and what sort of prognosis your vet can give you.
I will say she needs to start eating, so I would get her in to your vet today if at all possible.
I’m so sorry this is happening. It’s scary when it’s so sudden. My heart goes out to you as my stinky kidney cat burps in my face. Let us know what happens?