Wow! So sorry to read about your flock! I’m glad you have solved the mystery. I’d hang onto that lone hen and start checking out the hatchery websites. Unless you want a purebred flock, why not get one or two chicks of some breeds you’ve been curious about? Try a few and see how you like them.
How did your rooster turn out?
How did your rooster turn out?
What a tragic episode for you! Is your rooster still alive? Do I understand only the one hen survived?