The Last Entwife, or The Last Unicorn?
If you are not familiar The Last Unicorn is a novel and Rankin Bass movie that is like The Little Mermaid but darker, and it is a social commentary about the stories we tell, and how we see the world (as individuals.) All this social commentary will fly over a child's head if they saw the movie but a teenager or an adult would get it.
https://www.bustle.com/articles/57686-8-genuinely-important-lessons-the-last-unicorn-teaches-you-when-you-re-watch-it-as-an-adult