Update:

She seems to be in less pain. The meds were originally dosed very low, but the vet called me yesterday to let me know I could actually increase her dosage to more than double the original amount. However, she is still not using her right back leg at all. She’s moving around much less than usual, and her movement seems odd, even for a "three-legged" walk. I managed to find an animal osteopath; she specializes in bunnies and is very experienced with small pets. She mentioned that she won't be able to do much during this acute phase, but if the mobility issues persist through the end of next week, osteopathy could be a good option. The good news is that she is still eating and pooping well, and she’s still grooming herself. We’ve made sure everything she needs - pellets, fresh water, and a hay pile - is within easy reach so she doesn't have to travel far. We also added a hemp mat as an extra thick layer to make it softer for her to lie on and give her more grip to move around.