What metaphors are used in Scribbler of Dreams by Mary E. Pearson?

Maggie's diaries, saved from her old farmhouse, are kept in the garage by Allison Crutchfield. Kaitlin reads through the diaries and discovers that Maggie is not a promiscuous girl who began a family feud, but was seduced by her sister's husband. The diaries are beautifully written by Maggie, who records not just her hopes and fear and dreams, but the events of her life as well. The diaries are a written metaphor of her identity.