yes. I have seen threads here on BYC where people have reported hens (sometimes the broody herself) attacking and even killing chicks, but I think it's unusual and unnatural. You've kept the broody in sight of the rest of the flock throughout and it sounds like they have plenty of space and...
I would advise you not to intervene. The broody knows more about the other hens and about raising chicks than you (or I) do. They live together 24/7 and work out the flock dynamics; you just drop by occasionally.
I have had multiple broodies raise scores of chicks within the...