Introducing old cat to kittens

[teenagersandatoddler]

We introduced our 9 year old cat to the kittens and she hissed at them and tried to swat them. How do we get her to tolerate them? We have a stress plug in things and currently keeping kittens in one room

You just do it incredibly slowly (sniffing through doors, scent swapping etc) before physically meeting and hope for the best. If the scent swapping goes well, then you can let the cats explore each others areas - but only whilst the other cats away, so if your cat is shut in the kitchen let the kittens explore the home, if the kittens are shut in the bathroom let the cat explore the kitten room. It gets them used to having shared spaces. Then you can let them see each other (but separated by something) and see how it goes? Then hopefully it can move on to shared spaces and not having to worry if it all goes well.

They might become best friends, they might dislike each other forever - unfortunately only time will tell imo! Make sure they've got separate everything (food bowls, water bowls, litter trays if you have them) to start to avoid any sort of resource guarding. Make sure both cat and kittens can escape and hide if they want to rather than force the interaction.