A broody girl and introducing chicks question (she's the loner of the crew)

We've got a Barred Rock thats been broody at least a month. Theres no chance the eggs are fertile as our Rooster died around that time. She's always been a loner. Im afraid the other girls might peck or attack the chicks. Is this a reasonable concern? The chicks are also a week old so Im already taking a chance but I really need to get her off the nest for health reasons.