 Complete the following phrase:  In 2007, she failed to run a single sub-24 or sub-52 second race. She failed to reach the relay final at the 2007 World Championships, but won a relay gold medal at the 2007 Summer Universiade. She reached the 400 metres semi-final at the 2008 World Indoor Championships, and at the 2008 Olympics she reached the semi-final of the 200 metres, was disqualified in the 4 x 100 metres relay, and failed to reach the final in the 