If the poos are green she has an infection so react swiftly Mammyshaz. Probably a large soft-shelled egg that she couldn't shift and burst and which may have cut her internally. Worth keeping a close eye on her. Peritonitus is when the egg slips out of the oviduct internally and sits in the abdomen. Not terminal but very expensive to cure -£200 plus, based on surgery, abdominal draining and hormone treatments. Yes, it does work, but beyond the scope of most vets.