There have been some attempts to bring her work to the screen, but they haven't materialized into full-fledged movies.
However, there are a few possibilities:
* Television movie adaptations: It's possible that a network or streaming service might consider adapting one of her books into a television movie, as these are often less expensive to produce than feature films.
* Direct-to-video releases: A similar option is a direct-to-video adaptation, aimed at the home video market.
* Fan-made films: With the rise of independent filmmaking, there is a chance that fans might create their own short films or even full-length features based on her books.
Ultimately, it's up to producers and studios to decide if they see the potential for a Mary Downing Hahn film. Her books have a devoted following, so it's not completely out of the realm of possibility.