I counted today and she has 15 eggs under her. The other day, I put a flake of hay in the house and put like half of it on her. She has made a nice nest, with high sides of pine bedding and hay and her feathers. So I think she's staying warm enough and keeping the eggs warm enough.
Sounds good...
What do I need to do when they hatch?
-Do I just turn on a light in the house for them to lay under, regular light bulb or the purple/red one thats supposed to be hotter?
Unless it gets cold enough to freeze their water I wouldn't worry about a light. The red ones are to help prevent pecking (the theory is that they won't see the red of blood because of the light color, therefore they won't bother any sites that have blood on them) If you do place a light in the coop with them make sure it is in a location that allows the hen and chicks to move away from it if they don't want the extra heat.
-I have manna pro medicated chick starter, is that good? Yep, it is personal choice on medicated vs not medicated
-They live in a chain link dog kennel, I'm going to but chicken wire or hardware cloth around the bottom few feet of the kennel, will that be alright as long as they can't get between it?
Yes, make sure there are no gaps they can sneak into and get caught up in, and that it is smaller size openings (like 1/2" hardware cloth) so they can't get their feet or heads through it and get stuck... but that should do quite well for them.
-They have a ramp to get into the house, its only like 5 inches high and its at like a 5 degree slope, so not drastic. Will they be able to go up and down the ramp okay? Will the hen be able to help them?
Sounds like the ramp should be easily workable for them, mama may not bring them out the first few days, but watch closely for when she does and make sure all the little ones are able to navigate the ramp. Some may need help the first time or so, but within a few days they are pretty darned agile!
-Should I let the hen raise them, or should I bring them in the house in a pen with a light and food and water? I would only bring them in if its too cold, but I don't want to take them away if I don't need to.
We left ours with the hen, but our coop allows them room to move around without having to go outside yet since their is pretty nasty weather here. Our coop has been in the 20s most nights since the chicks hatched and we have heat bulbs over the water but that's it, and ours have done fine. I was out in the coop today doing cleaning, temp inside was about 28-30 degrees and the little ones were running around everywhere! They would just run back under the mama hen every once in a while to warm up for a few minutes, then they'd be out running around again. They are VERY active, even with the colder temps. As long as your mama hen has a decent nest area available, and your coop isn't drafty I would say they should be fine. Just monitor them for a day or so to see how they behave and judge from there.
Do you guys who have winter hatches let the mamas raise them or do you bring them in?
I've never had chicks before. She laid on 7 last summer, 5 got taken by a snake, one didn't hatch and the one that did, it didn't make it. So I didn't have to do all the preparation that I'm going to have to do with this batch of chicks.
Will she go broody again in the summer time? Is she just going to be a constantly broody hen? hahah. I thought jersey giants weren't supposed to be super broody because of their size. I would love it if she went broody all the time! This one I can't answer, seems like hens have their own little time tables and us silly humans are stuck being observers
Sorry for all the questions, I'm just newish to the broody part of chickens and I'm a little worried because of the weather. Trust me, we were the king and queen of over worrying things when we were waiting for these little ones... so can totally understand your concerns!