One of my daughter’s female Pekin ducks died overnight. She was a year old nearly to the day. She was a normal egg layer and was otherwise healthy. About a month ago she went through what I’d consider a molting period losings a bit of feathers during a heat spell. Thereafter all of her feathers came back in thick but for the past month she stopped laying eggs. She was fed a diet of Purina Duck Pellets supplemented by a heaping handful of frozen peas probably 4-5 days a week along with niacin water supplement and Oyster shells. Last evening I went to her pen and she was laying inside just looking at the wall. She came out with the other ducks but didn‘t seem herself. We brought her inside and let her soak in a warm bathtub for an hour massaging her stomach and she remained lethargic. Within 2 hours she started having labored breathing. The breathing never got better and she passed away 2 hours ago. Any idea what it might have been? She was last out of her pen the day before. We have wild cherry trees in the area so could she have eaten one of those? We have another female and male Pekin. As a precaution I’m completely cleaning out the pen. What else should I do?