I have read the letter stating that Lucy was the daughter of Gov Brown of TN and was supposedly black balled by her father because she married James Johnson and the Johnsons were opposed to slavery. James and brother Levi fought for the Confederacy during the Civil War.
I haven't found anything showing either Govenor Aaron Venerable Brown or Neill Smith Brown were in the vicinity of Warren County, TN or around McMinnville, TN...I know James Johnson was from McMinnville, TN and I believe I have seen that Lucy was from that area as well. Nathaniel Brown and Red Brown were living in the vicinity of the Johnson family before Lucy and James married...it appears Red may have been a widower
with a daughter around Lucy's age living with him and Nathaniel and wife had a daughter in the age group of Lucy too so I would be guessing that her father was one of these two men or they were related to her somehow for her to have been acquainted with James.
I am sorry that is the best I can offer...
I can bring Lucy forward, have hit a brick wall with her going back tho.