Facts and Events
As best as I can transcribe:
1850 US Census, Raisin Twp, Lenawee Co, MI
1860 US Census, Coldwater, Branch Co, MI
It is difficult to tell exactly what the name is supposed to be. Mariann seems like a high probability.
In 1870, there is a single girl, Marian Harkness, age 22, living in the household of Geo. Holden and family, a Stock Dealer in Adrian, Lenawee Co, MI.
There is also a Marian Schofield, age 24, wife of Freeman W. Schofield on Jackson County, MI, which is only interesting because of the following.
In online records for Branch Co., there is a marriage record for a Mariam/Marian V Harkness and Alonzo E Schofield on Nov 11, 1880.