On the bright side, Peggy is still eating, drinking and leaving the nest on occasion. We know she must be getting up at some point during the day, because Tina somehow manages to get in there and lay an egg. I have been taking her out of the nesting box every morning to do some free ranging. So, she's at least stretching her legs and wings once a day.
The main problem is that it's hard to collect Tina's eggs with Peggy sitting on them. She gets really pissed when I try to reach underneath her. For a little, fluffy hen, she can be kind of scary. I have been painfully pecked several times. Eventually, I manage to get the egg away from Peggy, but it's not easy.
One funny thing I've noticed about broody hens: they make the craziest noises. There's the weird chicken growl I get when I'm lifting Peggy out of the nesting box, and this loud, crazy shriek she makes before running frantically around the yard after I put her out. Basically, Peggy sounds nuts. But maybe that's all just part of being broody.
Also, I recommend doing everything you can to avoid a broody poop. (That's the one giant poop a broody hen lets loose after she's been holding it all in while sitting on her eggs.) They are foul!