Kitty is acting weird..

If your cat has been fixed, she will not be able to reproduce, and should not be going into heat. When a female is spayed, they remove all the reproductive organs, uterus, everything...

Maybe there´s been some sort of change in your home that´s causing some stress for your cat? It doesn´t take much change to upset a cat´s routine. You might want to give your kitty a little more attention to assure her that she is loved.

If you still think she´s in heat, you may want to talk to your vet about it.