My mother cat (2 years old) had 5 kittens, they are now 7 weeks old and randomly she has become aggressive to the point where I have to lock the kittens in my bedroom away from her. She will meow really loud and hissing and try to attack her kittens. I don’t understand what is happening. I don’t want to keep her away too long but I’m afraid for the kitten’s lives. I had a bunch of separate food & water bowls, also litter boxes. I would like to figure out what is wrong because I can’t keep them separated forever and I plan on keeping them all.