My Bantum insisted on hatching an egg. She kept brooding on the other hens’ eggs but I kept taking them away. Didn’t really want more babies. But I gave in and let her keep one. I candled it a few days later to make sure all was as expected. It’s now day 25 and no sign of hatching. When candled, it’s all dark. Water test indicates it’s a viable egg. Should I assist the chick? I’ve never run into this problem before. She’s not leaving the egg at all now.