She competed for Germany in the 1932 Summer Olympics held in Los Angeles in three different events, taking the bronze medal in the javelin.

Four years later in her home country at the 1936 Games she won the gold medal in the javelin in front of the Berlin crowds.

[1] Fleischer travelled across the Atlantic Ocean on board the SS Europa with the other members of the German team and then across the United States by train to Los Angeles in order to compete at the 1932 Summer Olympics.

[2] She also competed in the Women's 4 x 100 metres relay with teammates Grete Heublein, Marie Dollinger and Braumüller.

[7][8] Hitler was later warned by Olympic officials that heads of states were not permitted to conduct such congratulations, which in 1984 was what Willi Daume claimed had prevented Hitler from congratulating gold medallist Jesse Owens, causing the story that the Nazi leader refused to shake his hand.