Wow! Granny certainly had an interesting mixture! I like the system of giving a child both a familiar and an exotic name
It looks like a blend of Dolores and Cynthia, or Dolores, Cynthia and Dorothea perhaps. Canyou find any information about your great-grandmothers - if any of these names was in use in your family, or any others that would work in the same way, then you could be pretty confident.