I noticed my broody left the nest for about 15 minutes this morning, but got back on and is hanging in there tight so far. Giving her food and water by the nest now. Other chickens are still laying in her nest, but I have decided if this experiment fails I will build a broody box for the next broody where I can keep her segregated. My ex has a large dog crate that would work, but I don't want to ask her for it so will probably build one out of wood, with a hinged roof that I can lift and access everything. OTJ training!