God creates creatures and humans in certain ways to bless our lives. I know it is a deformity that could potentially be passed on. However, is that deformity one that at the moment is costing you vets bills or special feeds bills? Before culling because of what she looks like today, consider placement at a sanctuary where her quality of life will be so good. She is still a young goat and can bring so much joy and love to some one. If finding a home for her becomes a chore and her bills appear then I would consider as a last option culling. As an animal breeder / advocate and rescuer, like a medical practitioner, "first do no harm", and consider a right to life.