Hello Red. Sounds initially from your description like it could be broken egg. But we have some wood shavings that go orange when wet and a hen with a digestive problem that sleeps on the floor who has a slimy orange bottom as a result. Have you checked for sour crop -soggy crop that doesn't empty overnight sometimes accompanied by bad breath? That would give slimy poos. Have you checked her vent for signs of eggshell or found any eggshell on the floor?