The former World Masters champion can add the 2020 Dutch Open Ladies Pairs title to her long list of accomplishments.
Winstanley paired with Margaret Sutton to defeat Dutch duo Anca Ziljstra and Femke van Zuiden 4-2 in the final.
The British twosome came through the field on Friday to win their group without losing a leg from three rounds played.
It earned Winstanley and Sutton a place in the last 16 where they overcame Page and Bulmer 3-0, then Krappen and Waldschmit 3-0 in the quarters.
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The semi-finals proved to be a tougher test of their mettle against da Graaf and Prins but the British duo showed their strength in a 3-2 victory.
While the tournament had been played as a best of five legs in each match, the final was a best of seven showdown.
But it didn't knock Winstanley and Sutton off their game, as they completed a 4-2 victory and the Ladies Pairs crown.
The Buxton beauty therapist, 44, also entered the women's singles draw, beating Mandy Smith 3-2 before bowing out at the last 16 stage to Maria o'Brien 4-2.
That title went to Aileen de Graaf. The 2014 and 2015 winner added the 2020 title to her collection after seeing off Anca Zijlstra in the final.
While on the men’s side, Ross Montgomery claimed the singles trophy with a 3-1 win over Brian Raman and won the pairs final with Martin Adams earlier that day to make it a tournament to remember.