Dear Zoe Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

Dear Zoe Summary and Synopsis

A year after her family suffers an unimaginable loss, teenage Tess pens a heartfelt letter to her dead little sister Zoe, reflecting on what was lost, her resistance to traveling with her family down recovery road, and the surprising sources from which she gains love and support so that she can begin to get better.

Source: Wikipedia (CC BY-SA 3.0).