As a result , Marlena Wesh moved up to third position to qualify for the semi-finals .
Jennifer Padilla originally finished in third place with a time of 51.74 , but was disqualified due to lane infringement .
Marlena Wesh moved up to third position to qualify for the semi-finals .
Jennifer Padilla originally finished in third place with a time of 51.74 , but was disqualified due to lane infringement .