I never separate my broody from the flock. I find that she knows best how to take care of them amongst the others. That said, mine have a huge pen, so she has some room to protect her chicks if need be.I would say defiantly keep mama and chicks away from flock for as long as possible! I had a horrid experience last fall when my silkie had two chicks.... I waited a couple weeks to put them in with the whole flock only to find two trampled baby's in the morningI cried all day! I wouldn't want anyone to have the same experience!