This does not answer your question as to Native American Heritage as it will take a substantial amount of research.
The upside, Rose's pedigree going back to the 1600s
Looking through the data, you are a distant cousin (8th & 5th) of mine..
As for the genetic testing the traces become obscured for generations beyond a certain point for the low cost type of testing.
---------------------
There was a name variation. Plonkey, earlier, was sometimes Plauqué or Plantier depending on the priest's spelling.
Rose (Rosanna Alphonsine Plonkey/Plantier/Plauqué, etc) was the daughter of François Xavier and Philomène Demers born 14 Jan 1892 Dover Twp, Kent, Ontario
The below listings give a substantial amount of pedigree information for you to dig through and verify.
Many listings for the parents of Philomène Demers the mother of Rose Plauqué on Rootsweb:
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=Search&am...------------------------------------------------------------------
Several listings on Rootsweb for the parents of François Xavier Plauqué
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=Search&am...-------------------------------------------------------------------------------------------------
This is the pedigree of Eustache Demers b 1844 the brother or Philomène Demers b abt. 1851 the mother of Rose Plonkey
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&d...-------------------------------------------------------------------------------------------------
This is the pedigree of Francois Xavier Plauque the husband of Philomene Demers
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&d...-----------------------------------------------------------
Family Search Record
Name: Jessie Ward
Event Type: Marriage
Event Date: 20 Nov 1909
Event Place: Courtright, Lambton, Ontario, Canada
Age: 20
Birth Year (Estimated): 1889
Father's Name: Wm Jas Ward
Mother's Name: Nancy Williams
Spouse's Name: Rose Plonkey
Spouse's Age: 19
Spouse's Birth Year (Estimated): 1890
Spouse's Father's Name: Frank Plonkey
Spouse's Mother's Name: Philiman Demarsh