Question: What was the first onscreen appearance of the British-American actress who starred in "Parade's End?"

Context paragraphs:
Syd Woolfe: Sydney "Syd" Woolfe is a fictional character from the British ITV soap opera, "Emmerdale", played by Nathan Gladwell.  He made his first onscreen appearance on 25 March 2002 and his final one on 25 November 2004.

Outwitting Dad: Outwitting Dad is a 1914 American comedy film that features Oliver Hardy's first onscreen appearance.

Rufus Jones for President: Rufus Jones for President is a 1933 American Pre-Code satirical musical-comedy, clocking in at 21 minutes.  The film was directed by Roy Mack, and starred Ethel Waters and Sammy Davis, Jr., in his first onscreen appearance, as the title character.

The House Without a Key (serial): The House Without a Key is a 1926 American mystery film serial directed by Spencer Gordon Bennet.  It is based on the novel of the same name and is the first onscreen appearance of the fictional detective Charlie Chan, although the main stars are Allene Ray and Walter Miller.  The film is now considered to be lost.

Rebecca Hall: Rebecca Maria Hall (born 3 May 1982) is a British-American actress.  She made her first onscreen appearance at age 10 in the 1992 television adaptation of "The Camomile Lawn", directed by her father Peter Hall.  Her professional stage debut came in her father's 2002 production of "Mrs. Warren's Profession", which earned her enthusiastic reviews and the Ian Charleson Award.

The Wedding Song (film): The Wedding Song (Hungarian: "Nászdal" ) is a 1917 Hungarian film directed by Alfréd Deésy.  It featured Béla Lugosi in his first onscreen appearance.

Casino Royale (Climax!): "Casino Royale" is a live 1954 television adaptation of the novel of the same name by Ian Fleming.  An episode of the dramatic anthology series "Climax! ", the show is the first screen adaptation of a James Bond novel and stars Barry Nelson, Peter Lorre, and Linda Christian.  Though this marks the first onscreen appearance of the secret agent, Nelson's Bond is played as an American spy with "Combined Intelligence Agency" and is referred to as "Jimmy" by several characters.

Darker than Amber (film): Darker than Amber is a 1970 film adaptation of John D. MacDonald's mystery/suspense novel, "Darker than Amber".  It was directed by Robert Clouse from a screenplay by MacDonald and Ed Waters.  It starred Rod Taylor as Travis McGee.  "Darker than Amber" and "The Empty Copper Sea" (adapted as the film "Travis McGee" (1983) starring Sam Elliott) remain the only McGee novels adapted to the big screen as of 2017.  The film also marked the final onscreen appearance of actress Jane Russell prior to her death in 2011, with the exception of a documentary appearance in 2007.

Parade's End (TV series): Parade's End is a five-part BBC/HBO/VRT television serial, which is an adaptation of the tetralogy of novels (1924-28) of the same name by Ford Madox Ford.  It premiered on BBC Two on 24 August 2012 and on HBO on 26 February 2013.  The series was also screened at the 39th Ghent Film Festival on 11 October 2012.  Its five episodes were directed by Susanna White and written by Tom Stoppard.  The cast was led by Benedict Cumberbatch and Rebecca Hall as Christopher and Sylvia Tietjens, along with Adelaide Clemens, Rupert Everett, Miranda Richardson, Anne-Marie Duff, Roger Allam, Janet McTeer, Freddie Fox, Jack Huston, and Steven Robertson.

War Doctor: The War Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television programme "Doctor Who".  He was portrayed by the English actor John Hurt.  Although he precedes Christopher Eccleston's Ninth Doctor in the show's fictional chronology, his first onscreen appearance came eight years after Eccleston's; the War Doctor was retroactively created by showrunner Steven Moffat for productions celebrating the show's 50th anniversary.

Supporting paragraphs: Parade's End (TV series) Rebecca Hall
Answer: "The Camomile Lawn"