The ewe is not that much bigger than the one she is standing next to from the angle I am looking at. I'd like to see her next to several of the others for comparison. We have White Texas Dall sheep. Big horns like your Painted Mountain have. We have had a couple females with more extensive developed horns, and some extra "mane" hair - we call them bibs -
I would first see if she breeds. If so, then there is no big deal. If not, then it is time to either do testing or keep her as a "guardian/pasture ornament"....or cull her.
We tend to get better horns on the ram lambs out of the "better" horned females. We have 3 bloodlines that we are trying to "make" a better animal. One has fantastic horns and terrible feet, decent worm resistance; One line has mediocre horns and very good feet, fair worm resistance; One line has real good horns, decent feet, and terrible worm resistance. We are trying to breed the better worm/parasite resistance in with real good horns and good feet. Long process. Being in a "wetter" area than what these may be better suited to, the feet are important. But since we sell the rams to a hunting preserve, got to have good heads. And barber pole worms are the scourge here so we are trying to get them to be more resistant and not needing constant worming.
They are attractive sheep.