I have a question. What happened to Flemon when Michael Lewallen died in 1880. She died in 1922 and I can't find anything about her for those 42 years.
Also, for what it is worth, I have a hand written family record by Josie Chapman's indicating that she was called Flemon, not Flemming. It also shows up on a census the same way. I took a screenshot of the census, but forgot to label which census it was, but she is shown as being 21 years old. So it was probably the 1850 census.