I had an Ameraucana with a broken leg. I don’t know how it happened, or when. She was fine when she went broody, and brought her chicks out to explore. When I put a second broody in with her, they switched. She sat on the fresh eggs, and the new girl took the babies. She sat and sat, chicks popped out, and were running around (prefab coop, so they were not going anywhere). I put her on the ground, and took the eggs that were a week past due...
The second time is here.
https://www.backyardchickens.com/threads/recovery-from-an-explosion.1174370/post-18484562

The second time is here.
https://www.backyardchickens.com/threads/recovery-from-an-explosion.1174370/post-18484562