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Scoliosis is not common, but does occur. It seems to happen most in females who are used for breeding, dud to increased calcium needs. apparently, there are a couple of other spinal conditions that also occur. I'm not sure if any of them really fit what happened to Bethlehem. Here are two sites where you can read more and even look at photos of rabbits affected by these conditions. X-rays are also shown.
Here is a story about a rabbit with a spinal condition who was helped by physical therapists and other alternative therapies:
As for pain, Meloxicam is a pain medication. However, rabbits in pain do often become aggressive, so it may not be controlling any pain very well.
I wouldn't make any decisions about putting her down at this point. There are too many possibilities. What I would do is make an appointment with a rabbit specialist or a veterinary neurologist. This link will take you to a directory of rabbit vets:
Here are neurologists (they are not just for dogs):
If you need anything else, don't hesistate to ask.