This was a little hard to find without a married name. Is this Agnes?
Agnes B Alexander, 22, born and living Guelph, d/o James Alexander & Annie Brodie, married Fred'k Allen Best, 27, b Hannibal Mississippi USA, clerk, s/o Sylvester B Best & Mary b Clements, witn: J S Chency of London & Dolores M O'Doyle of Guelph, 25 Dec 1906, Guelph, Wellington County, Registration # 021419.
1911 census Frederick A Best b Oct 1880, aged 31 b USA, married, lodger, salesman is in City of Stratford, Perth North.
I don't see Agnes on the 1911 census. Could she be living in the US?
Births released to 1911; marriages to 1926 and deaths to 1936.
1911 census is the last one released.
Finally found something.
Frances Adele Best, b 6 March 1908, d/o Frederick Allen Best, clerk, & Agnes Brodie Alexander, informant: Jos Alexander of Guelph, Guelph Wellington # 052470.
That is all I could find on Agnes Best and any children.