I can't help you exactly, but I can provide you with more tantalizing information.
It is possible that Christina Blaikie was related to the famous Rev. Alexander Blaikie who according to J.P. MacPhie in his book "Pictonians at home and abroad : sketches of professional men and women of Pictou County, its history and institutions" was a direct descendant of Alexander Cameron. Rev. Blaikie was born in Pictou County, of course. Blaikie was a well known Prebyterian minister in Boston, but after coming from Pictou, he travelled extensively throughout the U.S. doing ministry. He also wrote extensively and some of his works can actually be found on the internet even though Rev. Blaikie died in 1885. Rev. Blaikie was born in 1805. I think he is not in your direct line, but is probably an uncle of cousin.
Alexander Cameron came from Scotland on the ship Hector in 1773. Although the Hector was not the first ship to land in Nova Scotia nor was the band of Scottish settlers who came with Cameron the first Scots in Canada, Nova Scotians believe the Hector group was a very important pioneer group in Canadian history. The ship was apparetnly the vanguard of the giant group of Scottish settlers emmigrating into Canada. People in Nova Scotia look upon the Hector with the same reverence that Americans look upon the Mayflower. There is a monument to Alexander Cameron and the Hector (why Alexander Cameron was singled out among the many Hector passengers is not clear to me yet). Also, folks in Pictou have recently created a replica of the Hector, because it means so much to them.
If you are descended from Blaikies in Pictou, it is very possible you are also descended from Alexander Cameron, which is really neat.
As for the first Blaikie that I know of in Pictou, there is a Charles Blaikie, who first came to Prince Edward Island in 1773, but his party, known as the Dumfries Settlers, had a great deal of bad luck and eventually removed to Pictou in 1775, where he finally settled down. Charles Blaikie was from Scotland, of course, but accounts put him in "comfortable circumstances" when he made the voyage.
I think that a lot of the Scottish people started coming to Canada, because bad times had occurred in Scotland after the battle of Culloden in Scotland. After the Scottish Clans lost that battle in 1742 or 1743 (I can't remember which), the English outlawed the clans and made things altogether bad for the losers. Alexander Cameron is said to have witnessed the battle at a young age and had two brothers who took part (An obituary states that Alexander Cameron was 103 when he died).
I'm sorry I can't connect all the dots together for you. I am having trouble myself finding the exact relationship I have to Alexander Cameron. I only know that my Great-Great Grandfather, Thomas Fraser, was a direct Descendant as was Alexander Blaikie. I have a letter dated in 1867 from Alexander Blaikie, which shows that he is my Great-great grandfather's uncle. But again, Alexander Blaikie does not explain the exact relationship, so these are merely clues.
I have been trying to find out the exact relationships. Hopefully, this information was helpful to you or at least provided a new tantalizing goal.