...any good resources for parents regarding disorder of written expression? I really expected to find a book on it, there are tons of books on other learning disorders, why not DWE?
This is not a book, but the website
https://www.understood.org/ shows 44 search results for "written expression disorder,"
including a downloadable fact sheet,
https://www.understood.org/articles/written-expression-disorder-fact-sheetand a guide,
https://www.understood.org/en/articles/what-is-written-expression-disorder.