Isolate post-spay?

My kitten was spayed yesterday, and the minute she got home, she immediately used the litter box, ate, and went about doing her kitten business around home.

Her vet recommended keeping her isolating her from my older kitten (9mo, neutered) for a week, but I'm concerned about the amount of stress that would cause her. I've been keeping her in a bathroom with litter box, bowls and a few toys whne I'm not around to supervise (between work and sleep, that's about 15 hours), which she of course isn't happy with.

Must I keep her confined for the entire week?

I nver have, I let them get on with what they want, but here in the UK a spay is almost always a flank spay which doesn't involve cutting muscle or connective tissue - it's parted, and only the skin is cut to get access.

I never have either. I might if I thought they were wrestling too much, or if someone was picking on the newly spayed girl, or if the make wasn't neutered and was trying something. But under normal circumstances, no.

Thanks! My concern is that their wrestling matches - which she almost always initiates - might lead to her wound opening up.