A fun, easy read is "Who Moved My Cheese". It's about 100 pages & illustrates the importance of being able to recognize the need for change & have the ability to go with it when it happens. It's detachment, on some level, in my interpretation.
It's used a lot in business but it's another of those "life" books for me. They make a teen version for kids (the story itself is the same but the intro/background is more relatable) and there's a cartoon version of it on youtube that DD watched when she originally read it since she was really young at the time. (be warned - the quality is not great)
https://www.youtube.com/watch?v=Txy6DwbwZ9g
We also have this .pdf posted in our kitchen as a reminder:
Who Moved My Cheese @ Mind Map Art