Charlotte Darroch, b. abt 1816 Ireland(?), d. 12 Aug 1886 Bothwell, Scotland, m. Henry Rennie bef. 1844. Charlotte's parents were Patrick Darroch & Jane Kilpatrick Dorrach McAllister (per scotlandspeople.gov). Charlotte had one son Charles Rennie, b. 20 Feb 184, who moved to Cape Breton, Nova Scotia abt. 1882-1885 with his wife and children. Her husband Henry died when Charles was age 10 and they stayed with some family named McAllister, which was Charlotte's mother's last married name.
Would love to find any further info on the Darroch side as this is all I know at this point.