Hi everyone, I'm starting this new thread because I haven't been able to find any answers to my questions and the other topics didn't really fit my situation.
A year ago, I adopted my first cat, a female. She's a bit of a loner but she's always been very sweet and cuddly (when she's in the mood, haha!). I've obviously had her spayed!
A month ago, I adopted a new little female kitten at just six weeks old (I know, that's far too early, but the mother had abandoned them and the person giving her away just wanted rid of her).
Anyway, I followed all the advice I read to the letter!!!! I kept them separate from the start, leaving the kitten in my bedroom with everything she needed and giving the older cat the run of the house. I swapped their scents by stroking one after the other to transfer the smells, and then I swapped their towels to mix the scents further. I introduced the kitten to my first cat using a carrier; my adult cat hissed and growled when she saw the kitten, but that's normal enough at the beginning. After a week, I decided to let them be together (except at night, when I put the kitten back in my room just to be safe). It didn't go too badly; after two days, my adult cat stopped growling and they were even playing together!
But for the last two weeks, it's been an absolute nightmare and I don't know what to do. My cat chases the kitten constantly (who hasn't done anything to her), catches her, pins her to the floor, and bites her hard on the throat!! The kitten screams and it's terrifying. I’m scared she’s going to kill her, so I shout for her to let go, but she just does it again and it’s getting worse and worse!! I don’t have a life anymore because I can’t leave them alone together, and the kitten cries her eyes out if I shut her in the room for even five minutes!! I’m stuck. Any advice would be much appreciated in this situation 🤧
P.S. I tried a pheromone spray that cost me nearly £25 and, of course, it didn't work.
P.P.S. Sorry for any typos... I'm just not in the right headspace to check them.

