Ann Gunn was named as the mother of Charles Gunn in the latter's 1844 baptism record.
In 1851 Ann was living in Dunn, in the parish of Watten, with her husband and children.
Sources
"Scotland Births and Baptisms, 1564-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XBMG-4LX : 10 February 2018), Charles Gun, 01 Jan 1844; citing , reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 990,557.