[8][better source needed] In March 1936, she also teamed with Miloslav Hamr to win the gold medal in the Mixed Doubles 10th World Table Tennis Championships in Prague.

In the competition they defeated Americans Buddy Blattner and Jay Purves in the preliminaries, as they won 21–19 in the fifth game.

[2][5][9][10][11] In the Women's Doubles in 1936, Kleinová and Jindra Holoubkova-Juarez lost to Americans World Champion Ruth Aarons and Jay Purves in the quarter-finals, losing 21–19 in the fourth game.

[8] In 1937, in the Mixed Doubles at the World Table Tennis Championships in Baden, Austria, Americans Abe Berenbaum and Emily Fuller upset the defending champions Kleinová and Hamr in the round of 32, by a score of −11, −15, 5, 19, 15.

[1] Kleinová and her husband, as well as her coach Eric Vogel, were deported by the Nazis to the Theresienstadt concentration camp in December 1941.