Could you confirm the name? You may be thinking of Howard Pyle (1853–1911), the famous American illustrator and author. If so, I'd be happy to write a 200-word bio of him. Alternatively, if Nina Howard Pyle is a real but lesser-known author, any additional context (nationality, era, genre) would help me assist you accurately.
Nina Howard Pyle
I don't have reliable information about a writer named Nina Howard Pyle, and I don't want to fabricate a biography or list of works that could be inaccurate.