Hi, Judy, and welcome, :-)
What were your temps when "Mexican Magic" first bloomed vs when it last bloomed, and showed less of the appliqué trait? At least for my micro-climate, this summer (with rare exceptions) overall has been very, very cool and windy. Though I may love the weather, special traits in daylilies (including appliqués and bold edges) do far better in hotter rather than cooler weather. Once it settles in, I would imagine that MM should do better when you have consistently hot days (and nights above 60 degree F). This also seems to be the case for those growing in other US areas in the southeast that experienced cooler temps than normal this year (and previous years, for that matter.)
Happy gardening! : )
