I have thought about it. I think I will breed her, but I will definately keep an eye out for what turns up in the offspring. If a lot of them are kinked after the first breeding, I probably wont breed her again.
You would think that if she were born with it, then the breeder would have noticed by now. So I am pretty sure its an injury or a scar from a past injury, or possibly maybe a parasite. And seeing as how this was one of her breeding pairs, they were selected for quality. Only time will tell.