I have a BO who's 2 1/2 now and never went broody. But we call her Auntie Ginger because when my other BO went broody 6 months ago, I tucked baby chicks under her to raise. Which she did. But after a few weeks, we noticed the babies hanging out w/ Auntie Ginger. I thought they were just standing around together. But she was helping co-parent them and show them where food was.
I was offering meal worms one afternoon and I kept giving one to Auntie Ginger who would drop it and the other hens would take it. I felt bad that she wasn't getting any so I scooped her up and put her inside the hen house and handed her one. She dropped it and made the chuck chuck chuck sound like come here, I've found food.
I thought I had lost my mind so I called my husband out and showed him and he just about fell over. I should have video taped it. I never thought a hen would do that until they had gone through the whole broody cycle. But I guess sometimes they never good broody but still want to be mamas.