NORMAN — Ella Parker’s first season as Oklahoma’s everyday right fielder couldn’t have gone much better.  The OU slugger just wanted a chance to help her team, and she produced an SEC All-Defensive Team season.  Parker has yet to commit an error, but her arm has become a weapon.  She recorded three assists, gunning down runners at the plate from right, representing an area of major growth for the junior.  “She really worked on strengthening her arm,” OU coach Patty Gasso said on Tuesday.  Parker hoped to put that work on display last year, but an injury limited her work in the outfield.  “She, back then, was having those shin-splint problems that we wanted to keep her off the field, but now she's feeling much better,” Gasso said.…