Hi Craig,
Very sorry for the late reply. Been fighting a tough cold for the last couple of weeks.
I visited Nova Scotia for the first time ever last year and fell in love with the place. One of my reasons for visiting was research, and I was fortunate enough during my visit to the Colchester Archives in Truro to have been put in contact with a Mr. Ross Graves, a specialist in Stewiacke Valley family research. The people at the Upper Stewiacke Museum also know him. Let me try to clarify your situation based on his info, and others on NSARM:
Your Catherine Ann is the sixth child of William Robertson and Ellen McLeod. I am descendant of your GG Grandmother Catherine's sister, Jane, the youngest daughter to the couple. Jane married her cousin James Peters and settled in the Stewiacke Valley. My Jane also spelled her name as Robinson or Robison more often than Robertson when her children's births were recorded.
I can't recall how to get you my e-mail more privately but I would like to share what more I have with you. If you can figure it out first I'll hear from you, if not, I'll talk to you soon.
Jeannie