Yeah, wait till they're old enough to stand a bit on their own. Pecking order behavior in chicks starts around 5-6 weeks. The bigger they are, the better.She does everything she should but defend them. She's at bottom of pecking order. They have been blocked off from the others for a week.
When integration time comes, spice up the run with some new perches and activities to keep the big girls distracted. Have ways the chicks can break line of sight without getting cornered. Add multiple feed and water stations so they can't be blocked from eating/drinking.
If you have 'one bad hen', she can be isolated instead of the broody and mother, to allow them to integrate with the rest of the flock.
Mind perch time - especially when the babies start getting interested in perching. This always caused me the most problems, where the big girls would kick them off the perches.