It appears that Dosithée may have taken the family back home to Quebec.
Start by checking these cemetaries and I will try and find a newspaper article - no guarntees on that one ??
Cemetaries in the eastern township of Quebec and remember she may not have a monument and would not be in a transcription of the cemetary .....
http://www.nekg-vt.com/Cemeteries-of-VT/quebec.htm#RANGE!A62...**********
You may have enough information to apply for a death certificate .....
http://www4.gouv.qc.ca/EN/Portail/Citoyens/Evenements/deces/...