I have been finding half shells of eggs several times a week and had my suspicions about which hen it was......one of my RIRs was always hanging out at the nest boxes and running the other hens out. Since I was home all afternoon yesterday, I checked for eggs every little while....went down & there she was, eating a freshly laid egg. I have her tied ( with a string on her leg ) to a tree outside the coop so she doesn't wander all over the neighborhood....she does have food & water, as well as a dog carrier for shelter. Does the mustard really work? What else can we do? Tried to rig up a rollout box situation, but the hens didn't want to go in & lay since I didn't have any bedding in there. put carpet in, but the eggs didn't roll.....that's why she's not in the pen today!