Winifred Carter was an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 author and playwright, who was particularly active from the 1920s-40s (not to be confused with Winifred S Carter, an American celebrity chef and cookery author also active from the 1920s-40s).
She was also the mother of the mystery and detective novel author Emery Bonett and the sister-in-law of actress and playwright Edith Carter

Edith Carter (playwright)

Edith Carter was an English stage actor and playwright, who was active in the 1920s-30s.She was also the aunt of the mystery and detective novel author Emery Bonett and the sister-in-law of author and playwright Winifred Carter.Plays...

.

Winifred Carter's most successful work was probably her 1945 novel Princess Fitz, which was made into a 1947 film of the same name.
It is a romance set in 1783, which chronicles the convoluted, yet ultimately doomed, relationship between a prince regent and a Catholic widow.

Plays

• A Man’s Enemies – Richmond Theatre
  Richmond Theatre
  The present Richmond Theatre, in the London Borough of Richmond upon Thames, is a British Victorian theatre located on Little Green, adjacent to Richmond Green. It opened on 18 September 1899 with a performance of As You Like It, and is one of the finest surviving examples of the work of theatre...
  
  , London
  London
  London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...
  
  
• High Fever – Arts Theatre
  Arts Theatre
  The Arts Theatre is a theatre in Great Newport Street, in Westminster, Central London. It now operates as the West End's smallest commercial receiving house.-History:...
  
  , London and repertory
  Repertory
  Repertory or rep, also called stock in the United States, is a term used in Western theatre and opera.A repertory theatre can be a theatre in which a resident company presents works from a specified repertoire, usually in alternation or rotation...
  
  
• Sarah-Duchess of Marlborough – Adelphi Theatre
  Adelphi Theatre
  The Adelphi Theatre is a 1500-seat West End theatre, located on the Strand in the City of Westminster. The present building is the fourth on the site. The theatre has specialised in comedy and musical theatre, and today it is a receiving house for a variety of productions, including many musicals...
  
  , London 1932
• Marriage Harvest – Q Theatre
  Q Theatre
  The Q Theatre, seating 490 in 25 rows with a central aisle, was opened in 1924 near Kew Bridge in west London by Jack and Beatie de Leon, and was one of a number of small, committed, independent theatre companies which included the Hampstead Everyman, the Arts Theatre Club and the Gate Theatre Studio...
  
  , London 1932
• Moloch. A play in three acts aka Escape from Glory (US title: Every Mother’s Son) – Players'
  Players' Theatre
  The Players' Theatre was a theatre in London as well as a theatre club for music hall in the style of the BBC programme "The Good Old Days".-Origins:...
  
   and Strand
  Novello Theatre
  The Novello Theatre is a West End theatre on Aldwych, in the City of Westminster.-History:The theatre was built as one of a pair with the Aldwych Theatre on either side of the Waldorf Hotel, both being designed by W. G. R. Sprague. The theatre opened as the Waldorf Theatre on 22 May 1905, and was...
  
   Theatres, London and Bard Theater, US; published 1935/—
• The Two Mrs. Camerons. A play in three acts (cowritten with Edith Carter) – Q Theatre, London and Townley Street Sunday School by the CS Players January 1945; published 1936/1937
• Wanted-a Wife. A Play in Three Acts (cowritten with Edith Carter) – Q Theatre, London and repertory; published 1936/1937 (possibly originally published 1922 or 1926)
• The Work-a-Day World. A comedy in one act for eleven women – published 1936
• Doctor Johnson’s Mrs. Thrale – Adelphi, Strand, Little
  Haymarket Theatre
  The Theatre Royal Haymarket is a West End theatre in the Haymarket in the City of Westminster which dates back to 1720, making it the third-oldest London playhouse still in use...
  
   and Kingsway
  Novelty Theatre
  The Novelty Theatre was a London theatre. It was located on Great Queen Street, accessed off Little Queen Street until 1905, and from the new Kingsway road from 1905 onwards...
  
  Theatres, London; published 1938/— (possibly originally published 1936)
• The Queen Who Kept Her Head. A play in three acts and an epilogue aka The Intriguing Queen – Kingsway and Adelphi Theatres, London and repertory; published 1934/—

Film

• Princess Fitz (US title: Mrs. Fitzherbert) UK 1947/1950 – based on eponymous novel