X2, very importantits always a good idea to have multiple feeders/waterers in case the established hen prevents them from eating/drinking with her.
But since the young ones out number the old girl, I would risk putting them all together on a day when you have time to sit and watch them.
They might be just fine. She might try to mother them.
Of course, if she does more than a random peck or two, then yes,catch them back up and go to the see but don't touch method.