Hen attacked a baby chick

[Wyandottes7]

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[SunnyCO]

My BO went broody so I got 12 fertilized eggs on line and was able to hatch one of them successfully. We had a huge drop in temperature when they were about 17 days under Goldy and I think that was the problem. Little Peep is an only chick now and is 2 weeks old. I thought I might start to integrate mom and baby into the flock but the 2 RR aren't being very nice, they are attacking mom. They were all raised together, the 2 RR's were 3 weeks old and the BO and BR were 8 weeks old and mothered the two little ones very nicely. They were a happy flock until Goldy went broody then they started being mean to her. Is this normal? How long to I keep them separated and will they ever get along again?