What a cute bun you have! To best take care of a bun after surgery, keep an eye on her to make sure that she is eating food and drinking water. Sometimes bunnies will not eat or drink until the next day because they are sleepy from the surgery, and might be a bit uncomfortable. However, if she is not eating at the end of the next day, then you might need to get an eye dropper to get some water and pellet/water mix into her mouth. If she’s not eating, also try offering cilantro, parsley, or treats that might tempt her to eat.
Other than that, make sure she stays in her cage, and also, if her litterbox has high edges, consider using her carrier (without the door) as a litterbox so she can walk in and out easily instead of hopping over the side of her box which may cause some injury to her surgery area. Make sure for about 2 days at least she stays in her cage and doesn’t go running or hopping around so that she doesn’t injure herself.
I hope that she is feeling ok, and she will soon be back to her happy self!