Another theme might be the search for stability. Given that she is 'shaky', perhaps she is looking for something stable in her life, whether it's a stable relationship, a stable home, or a stable sense of self. This could drive the plot as she tries different things and meets different people in her quest for stability.
One possible theme could be self - discovery. If the girl is 'shaky', she might be in a process of finding out who she really is, which is a common theme in many novels.
If 'the shaky girl novel' has elements of mystery, then 'The Girl with the Dragon Tattoo' might be somewhat alike. It has a strong female lead and a complex plot full of twists and turns. The two novels could share some common ground in terms of engaging the reader with an enigma to solve.
It could also have a theme of family. Family traditions, values, and how they shape the Indio Girl. The family might play a role in her upbringing, her choices, and her overall story. Family can be a source of support or conflict in such a narrative.
One possible theme could be the search for identity. Since it's a mystery involving a girl, she might be on a journey to discover who she really is. Another theme could be secrecy. Mysteries often involve secrets that need to be uncovered.
One possible theme could be time. Since it involves a calendar, the passage of time, the significance of different months or seasons could be explored. For example, the girl's experiences could change with each new month in the calendar.
One possible theme could be the power of knowledge. Since it's set in a library, the girl might be on a journey of learning and self - improvement through books.
Love could be a theme. Maybe the girl falls in love and has to deal with the joys and sorrows of a relationship.
Love could be a theme. Many novels about girls often involve their experiences with love, whether it's romantic love or love within a family.
One possible theme could be self - discovery. The girl in the novel might be on a journey to find out who she really is.
One possible theme could be self - discovery. The girl in disguise might be on a journey to find out who she really is. Another theme could be deception, as she is in disguise, so there must be some element of hiding the truth.
One possible theme could be cultural clash. The Puritan and Mohawk cultures are very different, and this would likely create conflicts and misunderstandings between the two girls.