My cat has been acting funny lately, what can i do to help her get back to normal again?

I think that my cat, Ruby, is depressed. My brother just moved back home along with the three kittens (less than or around 1yr old). We have two other cats who are older around 10 we think. It started off fine the cats didn’t like the kittens and they would growl and so on when they came near but nothing major.

Then suddenly one of our older cats started acting weird. Since it’s started she just finds a place to curl up usually tucking herself away somewhere, basement, porch, etc, right in the middle of things usually somewhat hidden. Now as far as I’ve seen today she hasn’t eaten, drank anything, or used the litter box. She wont’ eat dry treats, or moist treats, she wont eat her cat food, she won’t eat friskey’s canned cat food (which she used to devour on the rare occasions she got it.

She won’t purr no matter what I do. She used to purr the instant you touched her, and would always be looking for attention sit next to you and purr for as long as you just simply rested your hand on top of her. She used to constantly try to clean my hair and doesn’t seem the least bit interested in it now.

She just finds that hidden spot, and sleeps, and if she’s awake she stares around wide eyed, but it’s like she isn’t really seeing anything. It’s so upsetting, and I don’t know what to so for her. I looked up how to help a depressed cat, but none of the things I found seem to get any response at all from her. I don’t know what to do please help, suggest possible problems, and possible solutions if you can. I will keep you all posted here on how it all works.

~Battousai

PS – she did catch and eat a fair portion of a mouse about a week ago. Not sure if it matters but there it is in case it does. Oh and her ears seem hotter than usual too. Please help :-(