She acted in several Austrian silent films, and was considered a replacement for Liane Haid.

[1] She married industrialist Leon Joseph Koerner (or Körner) in 1923, and settled down in Vienna and Prague.

Rosenquist was of Jewish origin and had to escape following the Nazi takeovers of Austria and Czechoslovakia.

The Thea Koerner House Graduate Student Centre of the University of British Columbia was named in her honour.

[citation needed] Rosenquist played Rahel in 1919's The Jewess of Toledo and starred as Baronesse Tirnau in the 1922 biopic, Ludwig II.