This has seemed to resolve itself. Since her initial nest was on the floor, she slowly but surely lost all her eggs to either the neighbor dog or another egg-loving animal. Once she was down to no eggs, she flew back into the main chicken yard and lo and behold found a whole 'nother clutch of eggs compliments of the other hens. She is now happily setting on those. I shoed her off this morning and marked a bakers dozen for her to try to hatch out. Either I'll get little chickies sometime or the other, or she will unbroody herself. Either way is fine with me.
My nest box is a double seater, plenty of room for two hens. So, hopefully the other hens will continue laying and the broody hen can do whatever she feels like. I do plan to check eggs and not let her amass more than the 13 I've marked.
