Well, I'm on the fence with this one..
Since butters and lessers are not known to have kinking issues, I'd attribute this one to an incubation issue. Or a random fluke of genetics. Since technically color morphs are a genetic mutation anyway, these things can happen with any morph, at any time. Wether it's a morph prone to having kinks or other issues or not..
I think because the kink is not in a place where it would interfere with eggs or ovulation, that there shouldn't be a problem breeding her. I also doubt that it's a genetic issue that can be passed on.
If she's big enough, and healthy enough, I don't see a problem with it.