Remember When?

It all started when 12 year old, Alex Payne got her horse, Jello. She was popular, pretty and most of all She wanted to become a barrell racer, and thats exactly what she did. Two years later, she was racing, and fell off of Jello, causing one horses hooves to trample her. She has completely lost her memory, and Each Wednesday, she gets a letter titled, "Dear Alex, remember when?" explaining what her and this boy from her childhood did. Together, she will piece together, and slowly she gets her memory back, But who is sending the letters?