OP - I probably would at least get her and her eggs in away from predators somewhere. Perhaps a box in a corner of your coop or garage? Though tempted, I did not bring mine indoors. It is the holidays and we are having lots of company. Plus I would probably be committing to overwintering them. It really isn't good to take them into 40-50 degree warmer temps, then try and take them back outside. If you have had other hens in your flock successfully brood I would give it a try.
I like to baby my broodies. It convinces them I am their servant, so they teach their babies to be tame. My current mama is only a pullet born in March, but she is acting like a pro. The broody hens get all hormonal, pecking and growling, so I use a spoon to put a real yummy mash (yogurt, oats, regular feed, all warmed up) in the hen's face. She whacks at it, then has to taste it. They get the funniest look when they realize you are feeding them instead of trying to take the eggs!