We are our sisters' keepers- on human trafficking ("To be a Christian, we are commanded to bear one another’s burdens that they may be light, mourn with those who mourn, and comfort those who stand in need of comfort. We must let them know that their lives are worth fighting for. We are our sisters’ keepers.")
Sara, her mother, always has to listen to her beautiful daughter talk about how "ugly" she is. At this moment in the story, Sara has had enough of Kate's complaints and decides to shave her head to make her daughter see that hair does not control whether you are pretty or not because everyone is pretty in their own way.