As her actual maiden name(according to family search and/or wikitree)gives a maiden name of Humphryes or Guthrie)and because huband Archibald is already a proven biological son of theirs,she can't be a daughter of Matthew "The Rebel" Reagh and Jenot "Janet" Baxter.Please see https://www.familysearch.org/tree/person/details/LBL9-5F3 .
