Hi, You have posted to the WARNER Alberta Canada Location Genealogy Message Board
Not the WARNER surname message Board.
Were Henriatta WARNER - and family from the Province of Alberta Canada?
Just a Thought: Registration of Death - for Henriatta WARNER or whatever her married surname - may show the names of her parents - including mothers maiden name. if known to the informant.
Marriage Registration - may show the names of both sets of parents - including maiden name of mothers.
Have you searched Family Search Org - online?
Cheers & Good Luck, Stella