While Oakton gave Elizabeth Williams and Samisha Powell the defensive attention, Princess Anne guard Courtney Braxton torched the Cougars for 22 points and led the Cavaliers to a 57-42 victory in the semifinals of the Virginia High School League Group AAA girls basketball tournament yesterday at the Siegel Center. Princess Anne defeated Oakton in last year’s final. The Cougars rallied from a 24 …