Career
She competed in the singles event at the 1920 and 1924 Summer Olympics. In 1920 she had a bye in the first round and was defeated by Kitty McKane in the second round while in 1924 she lost in the first round to Sigrid Fick. With compatriot Lucienne Tschaggeny she had a bye in the first round of the 1920 women"s doubles event and lost in the quarterfinal to Winifred Beamish and Edith Holman.
At the next Olympics in 1924 she teamed up with Marie Storms and lost in the second round to Phyllis Covell and Kitty McKane after a bye in the first.
De Borman competed in all three events (singles, doubles, mixed) at the 1921 Wimbledon Championships. In the singles event she lost in straight sets in the first round to East. F. Rose.
In the doubles she reached the quarterfinal round with H.B. Weston. From 1946 to 1947 he was president of the International Tennis Federation.