
The photo has "Harper, Branches: Corisicana, Mexia and Waxahachie. Tyler, Tex." which identifies the photography studio.
According to a photographer reference book Catching Shadows A Directory of Nineteenth-Century Texas Photographers by David Haynes, Thomas J. Harper had studios in Tyler, Corsicana and Waxahachie in 1892 according to the Texas State Gazetteer and Business Directory.
On the back of the is written "Mrs. Laura Rigsby our good friend" in pencil.
I have not been able to find any further information on Mrs. Laura Rigsby. I not sure what information the seller used to state that Mrs. Rigsby was Mexican. The seller also implied that she was from Tyler where I would state that she probably had her picture taken in Tyler, Corsicana, Mexia or Waxahachie.

More research needed as soon as I have time.