The enumerator made mistakes in 1870. He's listed as "H. Morgan" next door to John "Barret". Do a search for Tennessee Morgan. Click highlighted "Residence" then enter Anderson Tx in the "Residence Place" box. Click "Search" and the sixth entry from the top will access the 1870 Census. There was a "real" Tennessee Morgan in Anderson County and the other entries are applicable to her. Your Tennessee Barrett wed John D. Calloway ca. 1884 but I did not find children born to this couple. Her death certificate viewable/printable on familysearch. On the search template, enter Calloway as the "Last Name". Click highlighted "Death" then enter Anderson Tx in the "Death Place" box. Click "Search" then click on T C Calloway entry that has the small camera displayed. Texas mandated vital records effective 1903 so there's no possibility of a death certificate. I have not established contact with descendants of Morgan Barrett, other than yourself. If you wish, I'll get on trail and find some? I'd like to see what info you have? Is there a family tree?