I think being broody is about the most aggressive stage of a hen's life cycle. If she is tolerant of you when touched, picked up, or when you need to check on/give/take eggs, I think she's got a gentle disposition towards humans overall. How is she with other chickens?
As a side note, I like to handle my broodies. Even with less tame hens, I've found they get used to repeated handling, and I often bring little bits of food and clean water in a cup to them in their nest (not tons of it, as I don't want her to poop in the nest). Eventually they seem to associate me with good things and bites/pecks lessen or stop entirely. It's fun to pamper them and means I can get closer to the eventual hatchlings.
