Update:
This morning I raked out the run as best I could, brushed the snow off of the ramp to the henhouse, and put a bunch of straw in the run. I opened the pop door, and...out came my chickens! Probably helps that today is sunny and not snowy like yesterday. The girls did seem very hungry and thirsty. Now, my only concern is that my BO sneezed (at least I think that's what it was) a few times. How worried should I be about this? She is eating and looks fine and I think she's the one that laid the egg I found in the nest box today. Should I do something for her?
Second update:
Someone started laying today! I guess the snow shocked her into it. Went back out to the coop after sledding and their was an egg in the run. Neither of my 2 layers do that. Also, my BO already laid an egg this morning and my BA's egg looks different. I think it was my little RIR.