Yes - Peggy Maggie Margaret can all be the same.
The marriage certificate for 1910 show her father as William. I'm curious about a William Orchard shown on the 1881 census in Teignmouth, Devon wife and daughter called Priscilla and another daughter Sophia. My aunty was called Priscilla Defiance. I've always suspected this could be her parents. They are on the 1901 census living in Plymouth.
Jackie