Journal writing has been popular for many, many years. Young girls were often given a diary in order to record their thoughts. They were encouraged to write every day, even if they had little of interest to report.
Diaries were often padlocked with a tiny key. The girl would hide both the diary and the key in order to prevent parents and siblings from reading their thoughts.
Diaries became important as a tool for historical research. By reading such records, historians are able to deduce what life was like during times of peace and war, during turbulent and peaceful times.
Your task is to imagine the diary entries that your protagonist would write. These do not have to be complete stories, but rather figments of time capturing the emotions that the individual experienced. Later on these thoughts might inspire a story, but for now the task is to simply write what the person most likely worried about, dreamt of, feared and yearned for.
Have fun with this one.