I found the notes: The Church that I was looking for is called Panayia Episkopi or Kimisis Theotokou (11th C) -- You won't find it in may guide books and it's between Oia and Fira - near the foot of Profitis Illias (Santorini's highest point)

One thing about Greece: Names of towns, cities, etc. can be spelled many ways or even be a different name all together. (Don't be alarmed - it's just the way it is!)

Enjoy. Susie Newton, MA