 Winstanley qualified for the 2011 BDO World Darts Championship, where she lost 0–2 to Irina Armstrong in the quarter-finals.The following year, she went one step further by making it through to the semi-finals, where she was narrowly defeated by Deta Hedman in a tie-break final leg decider.Winstanley qualified again for the World Championships in 2013, and made it as far as the quarter-finals, where she was beaten 2–0 by Anastasia Dobromyslova.