Trained as an actress at the Max Reinhardt Seminar there from 1941 to 1943, she had already been on stage in 1934 (together with her sister) at the Deutsches Volkstheater in a fairy tale play.
From 1949, she also received offers in the film industry, and had a brief appearance in the drama Gabriele Dambrone staged by Hans Steinhoff in 1943.
In the comedy Beloved Fräulein Doktor, Mill played a plainly dressed teacher who, thanks to fictitious love letters written by her students, transforms herself into an attractive young woman.
The production attributable to Heimatfilm was Hot Harvest, which was based on neorealist works such as Bitter Rice, where she portrayed the farmworker Auschra who falls in love with the son of a farmer.
In 1959, she had a brief appearance as Lady Doringham in the Edgar Wallace film adaptation of The Red Circle, directed by Jürgen Roland.