What is an example of symbolism in the novel, The Yonahlossee Riding Camp For Girls?

Sam's handkerchief symbolizes the ways in which Thea remains connected to Sam while she is away from home. Thea brings Sam's handkerchief with her to Yonahlossee. She keeps it in her dress and then under her pillow. Thea thinks of Sam almost constantly in her early days at camp, as it's the first time they've ever been apart. Eventually, Thea puts the handkerchief into her desk drawer and hardly thinks about it. Similarly, Thea doesn't think about Sam as often as she develops her friendships with other girls and rejects her relationship with her family members, as she feels they wronged her.