What has the author Penelope Treadwell written?

There is no author named Penelope Treadwell that is readily found in databases of published works. It's possible that:

* The name is misspelled. Perhaps a similar name is correct, like Penelope *Treadwell* or Penelope *Tredwell*.

* The author is unpublished or self-published. Their work may not be indexed in public databases.

* The name is fictional. This could be a character in a book or a made-up name for a specific purpose.

Can you provide any more information about Penelope Treadwell or the context in which you encountered the name? This might help me identify the correct author or provide a more useful response.