Don't put the chicks with the broody hen, when hens are broody I believe they should be left to themselves away from all others as they can get cranky. After she hatches, you might try this and see. Some hens will kill the chicks, others just won't accept them, and I've had some like a little junglefowl that had up to 13 chicks under her ranging from weeks to nearly months old. I don't think any of them were even hers, she just adopted them as she went a long. When you do it, try with only one chick first and set it down, let them come together instead of just tossing a chick at her. She'll probably peck it at first but don't worry about it unless something else happens, usually if they walk off together then all is fine. Repeat process with other chicks.