I can't believe that no one has posted here...hands down my choice is
by Pam Munoz Ryan
For the first 13 yars of her life, Esperanza led the carefree existence of a wealthy landowner's daughter — beautiful clothes, servants, extravagant parties. When bandits kill her father, Esperanza and her mother must leave their native Mexico. They find a new home among agricultural workers in Northern California. Esperanza struggles to accept her new life. The challenges she faces force her to tap reserves of strength that surprise everyone, especially herself.
Anyone else have a suggestion?