Grandchild Naomi Audrey Massey Lindley Reagan (1920-2000) told her niece that Lula was poisoned by wild onions growing by the river despite having safely picked and eaten them many times before. Lula's infant son Joe died for lack of milk some thereafter despite nursing efforts by Lula's sister Maggie. Lula's husband left their remaining child, Ida, in the care of Lula's mother, before moving to Oklahoma and starting a new family.
According to researcher Jean Hunter, descendant of Lula's sister, Lula is buried at White Rock Cemetery in Robertson County, Texas. Although her grave has not been found by FindaGrave volunteers, her father's stone is there and she is presumed to be nearby.
Texas Marriages, 1837-1973. W. E. Thomas and Malinda Louisa Williams. That this is a marriage record for Wilburn and Lula is based on the date, the place, the closeness of names (she is Louisa in the census), the lack of other records, and the lack of other candidates who fit this record. https://familysearch.org/pal:/MM9.1.1/F6BW-DMC
It may be possible to confirm family relationships with Lula by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Lula: