i have 2 kittens from the same litter, a boy and a girl, 2 weeks ago i gave girl to my mom cause i was lil scared to keep em together due to both of them not being spayed, ok so a week ago i got the female one spayed and she stayed over my moms for a week for the recovery, my mom has 2 more cats, a mother and a sister of my kitten and she was fine there, but when i brought her back she started to hiss and growl at her brother, i mean he likes to play and might get lil bit overboard sometimes but she is just not letting him close most of hte time. before they were always together, sleeping together, grooming each other etc, and now she is not lettin him close to her.