Hi Kris: There certainly appears to be discrepancies in the data regarding Elizabeth Potter. While I cannot offer any suggestions as to why the researcher shows the name of MOONEY for Elizabeth, some facts stand out rather clearly.
First: The elderly Nancy Potter is residing in the house of Caswell and Elizabeth Ewton in both the 1850 and 1860 censuses. Although these censuses do not give the relationship between Nancy and Elizabeth, the ages suggest a mother-daughter relationship. Also, Nancy has the surname of POTTER.
Second: Residing next to the Ewtons in both censuses is Isaac Potter and family. This indicates a close relationship, and my feeling is Isaac and Elizabeth are brother and sister; Nancy Potter being the mother of both. (It appears obvious that both the Potter and Ewton families found themselves residing in Sequathcie county when that county was formed. In other words, they never actually moved into Sequatchie from Bledsoe.
Third: Several of the given names between both families parallel one another. It is obvious that Isaac Ewton, son of Caswell and Elizabeth, was named for Isaac Potter. Silas Ewton was likely named for Isaac Potter, whose middle name I believe to be Silas. Isaac also named a son by this given name. Also, Caswell and Elizabeth Ewton name a daughter, Nancy, likely after Elizabeth's mother, Nancy Potter.
For these reasons, I believe, even without a marriage record for Caswell and Elizabeth, that her maiden name was POTTER. I have seen no evidence, great or small, that would suggest she had any other maiden name. I would like to know why the researcher attributes the name of MOONEY to Elizabeth. Perhaps he has something that I do not have. I am always very skeptical to glean data from certain sites. Too many times have some researchers posted incorrect or misleading data on websites for all to see, only adding to confusion and brick walls. I am not suggesting all of my data is perfect. However, it is a service to other researchers to add disclaimers to their work when certain conclusions cannot be substantiated. In other words, it is best to preface these with phrases such as: likely, probable, appears, etc. so that anyone reading that data can do more research and perhaps draw the same or different conclusions.
Interestling, there are still Ewton and Potter families residing in Bledsoe and the surrounding area. I have forgotten for the time being, but a POTTER is sheriff of one of those counties. I believe the Ewton Funeral Home is still in business also.