Impossible Love (German:Unmögliche Liebe) is a 1932 German drama film directed by Erich Waschneck and starring Asta Nielsen, Ery Bos and Ellen Schwanneke. It was the final film of Nielsen, and the only sound film she appeared in. It is also known by the alternative title of Crown of Thorns.
Nielsen only appeared in sound films.
It says this film was the first one she played in, so it stands to reason she acted in others that were both sound and non-sound. They keyword matches to sound make it think it's correct.
( z1 appear :ARG1 ( z2 person :name ( z3 name :op "Nielsen" ) ) :location ( z4 film :mod ( z5 sound ) ) :mod ( z6 only ) )