That definitely looks like something caused by an injury. One or two might have been there since birth.
As to it affecting her eating, your best bet would be to get an x-ray or ultrasound to see the extent of the damage. My instinct tells me it wouldn't affect her eating, but if it involves her entire spine and not just the top, it will definitely make eating the proper size prey difficult.
Poor darling. It wonderful you are trying to help her.
Gale