Yes, Margaret Campbell sounds familiar. She is sister to my Garrett Campbell.
I found it interesting that Margaret moved to Brazil, Clay County, Indiana. I did not know that!
Her oldest brother James Campbell was said to have lived there: Alexander Campbell's eldest son, James, settled in Brazil, IN and died in 1891 at the residence of his eldest son.
Please contact me. I would like to update my information on Margaret and will share anything that I have on the rest of the family.