During the course of yesterday, my broody stole two eggs from the adjoining nest. They're ceramic eggs.@Rick589 I was just reading through this thread. Good luck! I gave my broody fertilized eggs a few days for the first time so it's definitely a learning experience!
Also, I saw your question about stealing eggs and I thought you'd enjoy this thread: https://www.backyardchickens.com/threads/do-your-hens-relocate-their-eggs.1663457/
So she is now triumphantly sitting on four egg-like objects, tuk tuk tuk-king and growling through the day. And night.