What does Winter learn from the letters from Santiaga her mother gave the fateful day she was arrested?

Winter learns from the letters from Santiaga her mother gave the fateful day she was arrested that her father never stopped loving her and her mother. He wanted her to get in touch with Dulce so that she could get $50,000. Santiaga wanted Winter to promise to use the money to put her mother in rehab and to take care of her mother.