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The growling yet tolerating means she is still conflicted. Having her riled by disturbance can make her more likely to peck chicks she is not fully imprinted on. Once at point you describe you are likely less than a day away from hen fully accepting new chicks. Avoid letting move about much...

Imprinting is the issue here. And it is based on sound. Hen does not recognize new chicks based on sound. You need to force imprinting process. Simply leaving hen alone with chicks she is not imprinted on can be disastrous for chicks. Her chick she is imprinted on as that process started...