Lucy is next door to her mother in the 1850 census of Rush Co., Indiana.
That's one of the best clues we have that it is this Lucy Matthews
who married John Chism. Other clues also come from later censuses
where various members of the Matthews and Chism families live very
near to one another in Clinton and Huntington Counties, Indiana.
Other Chizum family researchers state that Lucy remarried in 1851 to
John's brother James Chizum/Chism, who had also been widowed.
Census: 1840, Rushville Twp, Rush Co., Indiana
Census: 1850, District 97, Rush Co., Indiana
Census: 1870, Polk Twp, Huntington Co., Indiana
Census: 1880, Polk Twp, Huntington Co., Indiana
More information: Ross Co., MARRIAGE Record
Sources for this individual: father Obadiah's will, censuses, Ross Co., Ohio marriage index, www.chizum.com