Especially for a Leg horn, my crazy chickens though the others help and a broody tries to hatch out 30 before ya know it, but I have dual purpose birds and they can handle about 10-15
She should, though they aren't known to be broody occasionally you will get one. as they are so light in the first place as long as she's in a place the others can't get to her, keep food and water close to her. She can feel those chicks moving around in there, be prepared to incubate them if...