Ninja hates her babies!

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.

Hi @kyatoriina13 and welcome to TCS! 

I'm sorry no-one has been able to help you so far.  It sounds as though the kittens are now about 7 months old?  Is there any way the vets can see to have Aurora spayed as it may be the issue?  She could very easily come on heat at any time.

I very much agree with @Mani  , as I think it may very well be the female coming into maturity that will cause her to treat them this way.

There are plenty of cats who are able to be fixed despite their heart murmur, and only a high graded murmur may be dangerous for her to be fixed.

I was worried about getting her fixed because of the murmur. I wouldn't risk her having a bad reaction to the surgery. Ninja is acting this way towards Spyro too, even though he did get fixed..

kyatoriina13 said:

I was worried about getting her fixed because of the murmur. I wouldn't risk her having a bad reaction to the surgery. Ninja is acting this way towards Spyro too, even though he did get fixed..

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That can be a kind of redirected aggression.

It really could be worth having a second opinion on the spaying thing.  I went to a specialised clinic to get Sundar neutered as he has a severely deformed chest.. I know it's not the same thing, but one vet wouldn't do it as they just didn't have the experience.

If she was a young kitten when the vet heard a murmur, it's possible she has outgrown it by now. Kittens can sometimes have an "innocent" heart murmur that disappears after a few months. It might be worthwhile to have her re-checked to find out whether she still has a heart murmur, and if so, whether or not her heart is strong enough for the surgery. 

They just visited tge vet last month. That's when they heard the murmur.

We have Momma and her 4 kids. They are 8 months old and she was teaching them that they are to old to nurse off of her.  when they stopped , she calmed down.  One of the girls nurses on herself.  

That's possible, but I haven't seen them try to nurse on her for a couple months..