Hi Lpuff - You've gotten some great advice. Do you have a good vet?
I've got your date marked so we'll be sure to wish you the best as it gets closer to the 21st.
Females definitely take a little longer to recover, but they should be at least nibbling on food within 24 hours of returning from surgery to keep their digestive system moving - if she is not, be sure to call the vet! Many times they will prescribe pain medication if they haven't already, as well as a gut motility drug to get her system moving.
Like the other post recommended - never fast your bunny prior to surgery and if anyone at the vet office suggest you do this - don't! Many times the reception or front desk staff are just so used to telling cat and dog owners to fast their animals prior to surgery, that they do the same thing to rabbit owners without thinking.(even if the vet wouldn't recommended it) So just remind them it is dangerous for rabbits to fast. If the vet suggest fasting, then run from that vet.
Some bunnies actually seem to heal very quickly and want to run around. IF that is the case, prevent her from jumping on things for the first week following the surgery.
It's also a good ideas to talk to your vet and have them advise you on what to do pre and post surgery - this will also help you be sure that your vet knows what s/he is doing. The advice should be comparible to what the House Rabbit Society advises