In 1929 she became a teacher at the Mission House Malche in Bad Freienwalde (Oder) in German, psychology and church history.
After matriculation in 1930 she studied psychology, art history and philosophy in Berlin and Hamburg.
This study was completed by a religious-psychologic thesis for her doctorate in psychology about “Consciousness of Sin in adolescent girls and its significance for their battle of faith.” Schlink was president of the Women's Division of the German Student Christian Movement from 1933 to 1935, and twice interviewed by the Gestapo for her defense of Jews.
On March 30, 1947, she and Erika Madauss founded The Evangelical Sisterhood of Mary in Darmstadt.
Today, The Evangelical Sisterhood of Mary has 11 subdivisions all over the world, with in total 209 sisters, and about 130 of these are situated in Darmstadt.