About exposure training. It works. We have twelve chickens. Most new dogs have instincts to chase, catch, and..... Whatever they feel come next, when they meet our girls for the first time. It's so scary when someone brings their dogs to play with our dogs. We have 3 large breed dogs, and love friends to bring their dogs, but 9/10 they chase our chickens.
Exposure training has worked for almost every dog that has come. We keep the new dogs chained, and allowed our girls to make the interactions. Only one dog I didn't trust whatsoever. But she ended up put down because she has serious aggression issues.
Tie your dog up to so etching sturdy. Stay in the room, and keep her away, just let her watch the bird, see the bird move. A lot of times it's just instinct that crops up, and can be somewhat over ridden, or taught that THIS IS NOT A PLAYMATE.
Good luck!
As for flighted or clipped. I'm going to clip. I've lost to birds to flight. They were not recall trained. But we have crows, ravens, eagles, owls, hawks, cougars, bears, and many other predators here and I'm not risking it. It makes me sad my birds can't fly. But it's safer this way, imo