I don't think you can "train" them in that sense. Most birds pick one person they like and choose them as their "mate". And anyone who tries to handle the bird can be hurt. Your husband should try talking to her through her cage on a daily basis if he doesn't and see if that helps. It'll take some time but if you get bit and never try and handle the bird again, he'll/she will think they're the "king" of the flock. And you don't want them thinking this, because you're the "king" of the flock ;)
Birds are or can be very sensitive, so be careful in whatever you do. Maybe check with your avian vet to see if theres anything that can be done.
Good luck
