Ok, sounds like I covered all the bases with what I told her. I even told her it sounds like someone is gonna be sleeping with baby chicks tonight, haha. She's got my brothers scrounging for firewood, and the dog locked up in another room. I don't think her house heats up alot, though. Maybe 70-80? It's a small house, but old. Her brooder is fairly small (she was only planning on getting 4 chicks, and was going to get something bigger to brood them in tomorrow.) so that might be a benefit right now. I told her to wrap a blanket around the brooder and across the top at least until the fire warms the house up, and she's looking for her hot water bottle, but if she can't find it she'll put hot water into mason jars or milk jugs, whatever she can find. I will tell her to watch the temps closely, too.
She's in Stanwood. They haven't had any really stormy weather today, other than the occasional gust of wind and rain of course. She didn't think they were in danger of losing power this time, or she wouldn't have gotten the chicks yet. When they lose power they're usually the first to get it turned back on or the last - we're hoping for the former this time! Worst case, I told her to take them to my aunts house in Marysville.
Thank you all for your help.
ETA: Oh, rocks are a great idea, too. I'll pass that along as well, thanks!