Thank you for the response. Yes it is different from her purring. Also, the litter box is kept separate from the kittens but she still gets scared if she goes to use it and hears them from the other room. When the kittens go near her, she swats and hisses. I feel terrible.
We adopted two new kittens, and my 2 year old cat will rarely use her litter box, even if we feed her a lot and add water to her food. She also makes odd beeping noises that are hard to explain. They are sort of like humming noises? She hates the new kittens and only goes to the bathroom once...
About a week ago, we adopted a 9 week old kitten. She was the shyest of her siblings (they were abandoned). She was super shy, would hide and not come out, etc. I have spent all my free time with her, and she now loves to roam the main floor of our house, play with us, loves belly rubs and...