1909: She was studying music in London when she appeared in a lighthearted West End musical titled Dear Little Denmark.
(Source: Who's Who in Musicals)

1911: She made her Broadway debut back in the U.S. in her most memorable role as Claudine, the title character in Ivan Caryll's hit, The Pink Lady.  She caused a sensation singing "My Beautiful Lady" while accompanying herself on the violin.  When she performed in the London production, she returned to the West End in triumph.
(Sources: Sandra Brennan, All Movie Guide and Who's Who in Musicals)

1913: She stared in the musical The Little Cafe.
(Source: Who's Who in Musicals)

1916: She starred in Ziegfeld's The Century Girl.
(Source: Who's Who in Musicals)

1923: She toured in the Follies.
(Source: Who's Who in Musicals)

1926: She sang "Valencia" in The Great Temptations.
(Source: Who's Who in Musicals)

1927: She retired after she married Charles Gruelle, a wealthy mining engineer..
(Source: Sandra Brennan, All Movie Guide)

1946: She made her final film appearance in Margie.
(Source: Who's Who in Musicals)

1953: Kay Williams appeared as Hazel Dawn in George Cukor's film about academy-award winning actress, Ruth Gordon (Rosemary's Baby, 1968), titled The Actress.  Ruth Gordon once said: "All I wanted out of a career was to look like Hazel Dawn and wear pink feathers."
(Source: Turner Classic Movies)

1988: She died in New York City in her daughters home at the age of 97.
(Source: IMDb)

Trivia
Her parents were American missionaries in Wales.
(Source: IMDb)

She sang soprano.  She was five foot five, with dark blonde hair, hazel eyes and a "peaches and cream" complexion.
(Source: Who's Who in Musicals)

Photos

(Source: Silent Movies.com)

(Source: Silent Movies.com)