Theodore's wife is indeed Cunigunda Schisler Goelzhauser.
Cunigunda's, or Kunigunde as she is noted in the church records of Ginseldorf at her birth on June 7, 1850, mother is Elisabeth Schmitt from the village of Stausebach, her father is Joseph Schuessler from Ginseldorf.
Ginseldorf and Stausebach are both in the area of Marburg/Lahn which is about 60 miles north of Frankfurt.
Both villages belonged to the electorate of Hessen-Kassel.
Elisabeth's parents are not Nicolaus Schmitt and Angela Putzer but Johannes Heinrich Schmitt and Anna Maria Maus.
Elisabeth was born in 1824 and died not in 1870 but in 1872.
I have a picture of her grave as I have one of her second husband Caspar Goelzhauser who is from my family.
If you want to know more you may contact me.