I used to have a buff orpington that was mean as a snake when she had babies. She would attack my feet if I walked by, try to kill my hand when I fed and watered her little family and was just all around unpleasant to deal with. She was a MAJOR pain, but you know what? She didn't loose many chicks, and she was good to her chicks. When she wasn't brooding, she was one of the sweetest birds in my flock, so there is hope that once she's weaned the babies from herself she may not be quite so crotchety. I've currently got 3 broodies with chicks, and only one of them will call the chicks to eat out of my hand. One of the others is usually a lap bird, but once her chicks hatched she decided she'd rather cuddle with them, and not let me so much as look at them. The other broody is a turkey, I'm not even going there. Nice broodies are far and few in between. I'd say what you've described is pretty typical behavior for a mama hen. If you're really worried about her teaching the chicks bad habits, take them away and brood them yourself. Personally, I just deal with it. They don't keep them all that long anyhow. Good luck!