Hi, thanks for thinking of her like that. You are right to be concerned, I was and still am. I am inexperienced with chickens and this is my first broody. I tried to break up her broodiness a few times. I took her off the nest multiple times, that sure didn't work, we had a race straight back to the coop. Then, we put her alone in the section where she currently is now for a night or two, that didn't work. I had her perched up on top of a pallet thinking the cool air under her might do it but it didn't. I am a softy and didn't want to put her in a crate. Now I see that may be the only way. Next time it happens, I won't give in for obvious reasons and get more fertile eggs. But I will try the cool ice pack wrapped in a towel under her, combined or in addition to the wire cage. Maybe that'll do the trick.
To tell the honest truth, I'm not even sure how we'll handle the chickies, but I will work on this beforehand. My husband doesn't want the extra cost of additional electric either. We do have an extra room in the basement we can keep them in if need be. It's still cold but not crazy cold like it will be outside. I have been hand feeding her but I know it's not enough, considering they eat all day. Having said all that, I got 8 chicks April 1st and they are all still with me. It is my hope, that this trend will continue. I love my "ladies" and sure hope Mrs. Cuddlesworth will be ok. I totally understand your worries! I will post back with updates and hopefully they will be good ones!