The 1900 US census for Renville Co. MN lists Thomas Whealy's wife as "Antona Jenete Whealy" born Aug 1866 in Minnesota - both her parents born in Norway.
Earlier censuses show them residing in Redwood Co. MN. and marriage record is indexed as -
https://familysearch.org/pal:/MM9.1.1/FDF8-YJWThe detail of info about that marriage might provide you with more identification of her parentage.