Alfred crossed the line in 10.72 seconds, ahead of the United States’ Sha’Carri Richardson in second and Melissa Jefferson in third.It was a first ever medal in the history of the Olympic Games for the Caribbean nation of St Lucia and Alfred made sure it would be gold.It was the culmination of a journey that began at the age of six or seven at Leon Comprehensive School in Castries, the capital of St Lucia, when the librarian noticed her potential as she was beating the boys.Yet there were bumps on the way too. Most notably when she quit the sport, at 12, when her father died. But she was…