Needs to be at least a good para long, covering all the major points.
Done.
Would be good to add who Dorothy was
Done.
Context
It was there that she began work on the book for which she is best known, Food in England. Shouldn't be unsourced. Take care that "for which she is best known" doesn't look like OR.
Repeated ref.
Approach
Maybe wikilink mediaeval?
Done.
It switches effortlessly from instructions Sure the source says "effortlessly"?