The biggest things vets worry about is jumping. Being somewhat active after a few days is usually okay as long as she’s not running around doing binkies and jumping up and down on things. I think that you would have to have very close supervised visits, and not let the circling escalate. My worry, (which I am sure is yours too) would be the circling would lead to a fight and she could then use her back feet to kick hard (in those spiraling fights) which could cause ripping of the incision inside…or because she doesn’t have any fur protection on her belly that another rabbit could bite her there during a fight.
I do still like the idea though of having her “safely” nearby where they can see and smell each other, and get used to each other again. And if you want to try to have regular visits, this is definitely a situation I would hover on. Be right there to stop any signs of aggression. Wear gloves so you can separate without getting bit yourself.
When you she say she leans up a lot — what do you mean exactly? Are they in a cage or pen situation? I remember I was so surprised when my bunny Jack, after a bladder stone surgery, was so excited to get to Vivian, that he literally tried to jump over the pen. I thought he would hurt himself because he got to the top and was basically half way over with the pen putting pressure right on his tummy. So if you have an pen, then I suggest putting a top over it too if you are noticing the pacing.