My 9 month old Wyandotte went broody about 5 days ago. She chose the favorite nesting box of all my chickens and every day the other 3 would get up in there and lay their eggs and every day I would take the eggs out of the box. Yesterday, I found her in a different nesting box and actually acquired some fertile eggs and placed under her, thinking what the heck, might as well let her have a go at it. She worked those eggs under her and all seemed well until this morning. She is now back in the favorite nesting box--which is empty--and abandoned those eggs we gave to her yesterday. I'm perplexed as to why she would abandon the eggs when she seems so set on being broody. Any ideas??