She is a small calico usually very vocal until today.There are three other cats in the house and they also have been throwing up. We have a fifth cat we kind of adopted OK kitty/simon (ok is aka for outside kitty). He was left by someone and we fed him and gradually he has came inside but all of are ore cats are spayed and nuetered except OK kitty. I'm concerned with kippers she also grunts sometimes when she jumps down from atop something

This might sound bad but try scaring your cat to see if it meows.If your cat and the other cats are throwing up you need to get them checked at a vet.Also try keeping you fifth cat away from the other cats.

I have a cat a calico x tabby she can not meow at all I think u should take her to a vet