I have a broody sitting on 3 eggs due to hatch in a week (we started with 6, but 3 were clears when I candled at a week.) I’m in MN, so probably a little colder than OP. We have lows in the 40’s, (mid-30’s tonight) and highs in the 60’s-70’s. Mama will keep them warm, and if something happens to her after they’re fully feathered, they’ll be fine as long as they are dry and not in a direct breeze. No need to bring them in the house until spring. It’s totally your call if you want to set her or not. They’ll hatch or they won’t. Mama will keep them warm until she weans them, and by then they should be fully feathered.