It's possible that:
* The name is slightly misspelled. Double-check the spelling and try searching again.
* The author uses a different name. Perhaps they write under a pen name.
* The author is relatively unknown. New and unpublished authors may not have extensive online profiles.
To help me find more information, could you provide any additional details about Diana Pinckley? For example:
* What type of books do you think they write? (Genre, subject matter)
* Do you know any of their books' titles?
* Do you know where they may have published their work?
With more information, I might be able to find more details about this author.