Mary is the daughter of Daniel Repp, Jr. b. 27 Sep 1819, son of Daniel Repp, Sr. b. 30 Dec 1779, son of Heinrich (Henry) Repp b. 1752.This is the Heinrich you mention who is brother to Conrad Repp (sons of Johann Caspar Repp).
I have a great deal of Repp information; contact by email if you have further questions.