Wild 'A life worth living' (book 3)

This is the 3rd book in the series 'a life worth living'. When Hero is injured Stacey is devastated. She had just broken him in and now this. School has resumed after the Christmas holidays and Stacey is happy to see her friends again. Whilst trying to battle school work Stacey is surprised to see a familiar face of a horse she had once ridden. Amarni. Amarni is misbehaving and won't let Luke ride her, or in fact anyone. Can Stacey help Luke and prove herself or will it or just turn out to be a mess?