Nope, personally i would still breed her. You dont know if its genetic or not and kinking isnt really linked to the pastel gene. It could have been from something totally unrelated like a temp drop/spike during incubation. Its also so minor that you hadnt noticed it until just now so clearly she can eat/poop/shed just fine. Its also really high up on her neck, nowhere near where eggs would be. Once again this is all just my opinion, others may disagree.