Broody not pooping
Does she have food and water she can reach without you letting her out?
I agree it sounds like she is dehydrated. I would recommend putting in Chick Saver or such as that makes the water taste good and can encourage them to drink. It will also give her some extra electrolytes and vitamins.
I too allow my broodies to come and go as they please, eating and drinking when they feel like it.
Broodies, as you know, only poop once a day, sometimes every other day, one very large, smelly, mess.
If she seems healthy, enticing with the water additive may do the trick to help "ease" things along a bit.
Sprinkling a bit of poultry dust in the nest can help with the broody mites, it won't hurt the eggs or the chicks.
Awesome I'll try both of those. I gave her some water with a bit of molasses in it to sweeten the water just a touch. I've never seen her drink so much! She must have been dehydrated. Is there any kind of meds I can give her to act like a laxitive? She always has struggled to poop and so I think going broody slightly intensified the problem. I just don't want her to prolapse by accident.
I think molasses itself acts as a purge for chickens...so a periodic dosing of that should do the trick.
Another thing would be some mineral oil.