I would still watch them closely to be sure it does not start again. Some hens simply do not make good mothers. This spring I had two broody hens adopt some chicks I hatched in an incubator, and they work together very well. Everything was fine until I tried adding chicks of a different color. They started picking and picking, eventually throwing the chicks in the air. Once I removed the differently colored chicks, they were fine.
I also had a buff Cochin hen that was setting, and she ignored every chick that hatched. If I did not pull them to raise myself, they would just wander off. Perhaps next time she will do better, perhaps not. Hens do not peck at their chicks to get them to do anything. Communication is vocal and visual, and they know what to do. Like CJR says, be prepared to intervene at any time.