whoop, I just looked up both red sex link and golden comet and I agree with cterbizan that it looks like a golden comet, i dont really know all that much about chickens but I think RIRs and most other reds are solid colors so because of the white feathers as well and her size im going to go with golden comet, she looks exactly like one however i am still sticking with my original statement of hen and the rest of the post, I just now think she looks exactly like a golden comet, either way shes very pretty though and I think you should keep her. congrats!
