If he's doing that it's a recipe for disaster. I'd clip her ASAP. My opinion is that while it's nice to have a bird that can fly, it's not nice to have bird who gets out and killed because it can fly. If he can't remember to close the doors, clip the wings.

And about her night frights: haha, 'tiels are so silly. I love them (can't have 'em because they are too powdery for me) but they are so silly.