The Glass Swallow — Julia Golding

Rain has a secret -- one that risks her whole world if it comes out. She designs exquisite stained glass for the windows of her city. But the law is clear: it is forbidden for girls to be part of the glassmakers' guild. To keep her secret hidden, Rain leaves home and travels to a strange new country. Her trip becomes a nightmare when bandits attack and she is abandoned in a society on the edge of disaster. To survive, she must discover new strengths in herself and seek out the other people that this society has scorned, including a young falconer who is one of the "untouchables."