What is Maya's most important possession in the novel, Maya’s Notebook?

Maya’s Notebook is her most important possession, a diary she is keeping to document all the events that led to her ending up in Chiloé living with Manuel Arias, as well as the day-to-day life of the island. Maya had previously kept a diary for years, but stopped around the time her grandfather died, when she started to slide into trouble with drugs and alcohol. Her grandmother gives her the notebook at the airport before Maya leaves for Chiloé, rekindling her love of writing and giving her an outlet to process all the events of the past few years of her life.