It should be noted that Texas is not"Old South", in the sense that the movies and TV portray that period.
Old South tends to be east of the MIssissippi River
It would include mostly Mississippi, Alabama, Georgia, the Carolinas, Tennessee
Louisiana is more French in it character, while Texas is more Spanish/Mexican in its history.
Miss Ellie would not have been the stereotypical southern belle, as such
Her family may have had land, but not wealth, necessarily, if Jock had to save SF from foreclosure,
a fact that Miss ellie callously disregarded when she wanted to give SF to Garrison,
and later gave half of SF to Clayton