Poor Nikita. It probably looks worse than it is. Most of my females were held overnight after a spay, except for Diva. She was done very early in the AM and was groggy at 7 PM when I picked her up. Also, your kitten has a small weight for her age. I agree with Neko; sometimes it's better not to know everything about what's going on with the poor kitty and see her in such a state.

Cyber-hugz to you and Nikita.