If you are wanting her to hatch eggs then rig up a cage with her nest and eggs in it. She needs to sit on the eggs 24/7 for 21 days to incubate them, with just 10 mins a day at this time of year to get off, have a poop and a bite to eat and get back on them..... in the summer, they can be off longer as the eggs don't get cold so quickly. I have an old small cupboard in the hen house that I put my broody hens in with their nest of eggs. I drilled a few holes in the door to let a little light and ventillation in but it's still pretty dark. I open the door once a day for them to get off and do chores whilst I supervise their feeding and interaction with the flock and then when they head back to the nest, I open the cupboard door to let them onto it and close it again. If they choose the wrong nest, which they do for the first couple of days, I wait until they settle and then pick them up and put them on their nest in the cupboard and close them in.... I make sure they have access to food and water in the cupboard although they don't eat much. Broody hens really like the peace and quiet of being locked away and go into a sort of trance. The act of opening the door and letting the light in, triggers them to get off the nest and poop and feed within a minute or two and they quickly get into a routine of it. Whilst they are off the nest I close the cupboard door so that other hens can't lay in their nest and then, as I said previously I, open it as soon as the broody heads back to the hen house. If that is the only nest in the hen house with eggs in they will usually go for it anyway.
All my chicks are reared like this within a large free range flock and even though my broody hens are low in the pecking order I have no problems with bullying.
Winter is not a great time to be raising chicks, especially if you have such a cold climate, but if you are determined to hatch some now then I would only give her four or five.
Not sure if you are aware, but breaking her from being broody now, will not stop her from becoming broody again in the Spring/summer when conditions are more favourable for raising chicks.