I have a two year old spayed cat, Ninja. Six months ago, my sister's cat had kittens and I adopted two. At first, Ninja would stay away from them because the mother was in the house. As soon as my sister moved, Ninja took care of the kittens, as they were only a month old and fed cat milk. She loved them, cleaned them, yelled at them when they were bad, raised them. I read that when the male kitten hits puberty or gets fixed, that its normal for her to be aggressive. But Ninja is already fixed, and the kittens are both female and male. She started growling at them and hitting a couple weeks ago. I got the boy fixed, but not Aurora because they heard a heart murmur. I don't know what to do, the kittens want to love their adopted mommy, but she's being awful. I don't know why, or what to do. She's only nice to my four year old cat, Psycho. *They've all been to the vet, and had distemper shots. And Aurora is the only one not fixed. Help please! It's breaking my heart.