Also sewn into the film is the idea of parenting yourself, how to be a parent to yourself. After all, Bella is both child and mother at the same time. One can think about the philosophical concept of finding one's parent within oneself.
All of this draws parallels to another very notable feminist film, 2023's Barbie, there, after all, the same themes are brought up. Bella is more of a "Weird Barbie" though.
Note, by the way, how her costumes change as the character develops and matures. At first they are simple, plain shirts, then - very bright epatastic images, and at the end - more restrained and monochrome. And Bella's hair is below her knees by the end.