Just to be clear, do you mean Robertson or Richardson? The biography says that Laurel married Thomas Richardson.
For what it is worth, I have a suggestion. It is possible that the Dibbles and Richardsons were Lutherans.
The births of Laurel Richardson's daughters Rachel and Susannah are listed in the Canadian Genealogy Index on Ancestry as found in a source identified as "D Broughton, Lutheran Church Records 1793-1832, Ontario Genealogical Society, Kingston Branch, 1987."
A search for Dibbles in the CGI shows the following Dibbles listings from the same source: Aaron Dibble, living 1823; Laurel Dibble, living 1811; Laurel Dibble, living 1823; and, William Henry Dibble born & baptized 1823.
It might be worth checking out these items but unfortunately, I believe that this source is not available online. Perhaps someone from the Kingston Branch of the OGS can help with a lookup.