Personally I think kinks are genetic AND egg-formed. I've never experienced it personally, but seen snakes that have produced multiple kinked babies (either in one clutch, or over multiple clutches) and ones that were just how the baby was positioned in the egg.
I agree with you - I don't think she could be bred, it doesn't look like she would be able to even pass a large poo without some discomfort - she may not be able to pass eggs period. I wouldn't breed her, just for the fact that it may kill her/be too painful to deal with.
I would return her, unless they would be willing to drop her price to the price of a normal - she may be a morph - but she should just be a pet. She is drop dead gorgeous, but the fact of the matter is that she has a defect (genetic or not) and cannot fulfill her intended purpose.