Runaway (audiobook) by Sabine Wilder

Susan Wolfe is your average high school senior, concerned with boys, grades and her favourite sport, cross-country running. However, her world gets flipped on its head when she discovers she is a werewolf. Tragedy strikes, but before Susan can deal with it, her best friend Anna's life is put in danger. Susan has to put her own burdens aside to save her friend. Together the two girls have to find a way to survive, all the while putting their bond of friendship to the test.