Since ther was no obstruction or gas, you need to get sth into her stomach. Give critical care and simethicone (baby gas drops – helps to get the contents in the intestines moving, gas or no gas). Many rabbits are not interested in anything sweet when they are feeling un-well. You probebly need to force-feed with a syringe, but you can offer hjer some on a spoon and see if she takes it first.
If you don’t have any CC, grind up some pellets (or take the residue pellet-powder that usually assembles at the bottom of the bag), mix with water and feed it in a syringe. If she’s not eaten in a good long while, pedialyte may be good. Canned pumpkin (unsweetened) is also good. Give her a tummy massage, it is also helpful.
I just went through the same thing with my bunny Yohio. We got sub q fluids at the vet, an injection of metacam and other than that I was just to feed him CC and simethicone and give tummy-rubs. And keep at it, because they may not snap right back, it can take days. I’m still feeding Yohio CC twice a day and it’s been a week tomorrow, his poops aren’t yet as big as I’d like them to be.
This is good info about this type of problem: http://www.bio.miami.edu/hare/ileus.html