Mary Polly moved to Henderson County, Texas and lived with her daughter Elizabeth Sifford/Scott.
(Ref 1)------------------------------------------------------------------------
Censuses1880 Census, Texas, Henderson County, District 34, Page 47, Household 430
.............................Age Relation..Occupation..Birth Places
Travis Scott ........63 Head........Farmer.........TN SC NC
Elizabeth Scott.....53 Wife...............................MO NC NC
Joseph Scott........25 Son................................TX TN MO
Seth G. Scott........22 Son................................TX TN MO
Sarah H. Scott.....24 Dau................................TX TN MO
Ashley Scott.........17 Son................................TX TN MO
Jack Scott.............14 Son................................TX TN MO
Fannie Scott.........11 Dau.................................TX TN MO
Thomas E. Scott... 7 Son.................................TX TN MO
Mary Sifford.........82 Mother-In-Law.................NC PA PA
1860 Census, Missouri, Stoddard County, Castor Township, Page 52, Household 365
.............................................
Age..
Birth Place
Mary Jefford (Sifford).........60...North Carolina
Andrew J Jefford (Sifford).19...Missouri
1850 Census, Missouri, Stoddard County, Castor Township, Page 23, Household 351
...........................
Age Birth PlaceMary Sifford.......48.....NC
Samuel Sifford...13.... MO
Mary Sifford.......16.....MO
Oliver Sifford......11.....MO
Andrew Sifford.... 9......MO
Reference
(1) 1880 Census, Texas, Henderson County, District 34, Page 47, Household 430