Ella Parker said her advice to teammate Kasidi Pickering was simple. “She’s Kasidi Pickering,” Parker said Tuesday. “You have to keep swinging. That’s the only way you can get out of a sort of funk or whatever.” Going into last week’s series at Texas A&M, Oklahoma coach Patty Gasso said her confidence in Pickering remained very high. Gasso backed that up by hitting Pickering, who had been battling a slump, behind freshman phenom Kendall Wells in the first two games of the series. Pickering backed up the confidence by delivering an RBI single in the fourth inning of Saturday’s opening game of the doubleheader, then coming through with a three-run home run off the top of the wall in the second game. “I could just see a big exhale and a little celebration,” Gasso said Tuesday ahead of the Sooners’ SEC Tournament opener Thursday. “I think she has found her groove. You could feel it. You could see it in her body language and the way she’s talking.…