I have a database of some 16,500 Trus(s)ler related surnames which includes some 800 Truslow names
I wonder if your Cynthia might have been the Cynthia M Sullivan who married John Fletcher Truslow on 5 May 1834 in Kanawha County, West Virginia. This Cynthia had two children with John viz William and Charles Truslow.
John died on 8 August 1887 so I would assume that if this is your Cynthia then she and John must have parted before that time for her to have remarried and have had more children?
I don't know anything more about Cynthia but I can take John back to the Thomas Truslow who emigrated to the USA before 1756.
Perhaps you will contact me on firstname.lastname@example.org