Career
Together with Marie Braun, she was the top national backstroke and freestyle competitor. At the 1932 Summer Olympics, Braun was listed for the 4×100 m freestyle relay, but fell ill and was replaced by Oversloot. Both Braun and Oversloot qualified for 400 m freestyle semifinals, but because Braun could not participate, Oversloot withdrew from the event, in solidarity.
She was born and died in Rotterdam.