Most feed stores only sell Peking or Khaki Campbells or sometimes Swedish…I’ve never seen Welsh Harlequin but then again I’ve not been to every feed store!I always get all females from major hatcheries by mail like MurrayMcMurray or Metzer farms
Also they sell them sexed at some feed stores

	
Do you have another duck available for your hen? She will be lonely without a companion... Perhaps you could set up a pen with netting for the two to roam in during the day?
		