I am looking for the marriage of Sarah Jane Moffitt. I've checked the counties I know she was in, have searched Ancestry and FamilySearch, Mocavo, posted queries, but in 20 years of regular checking I've never succeeded in finding her marriage or death. any help is greatly appreciated.

Sarah Jane Moffitt
b. 4 Feb 1839 MA/NY/Eng
d. 18 Aug 1866? Iowa? (her last known residence)
m. abt 1861? Iowa?
to William? Allen

dates, places and names are from a family book and are mostly unproven. not for lack of trying. we have her ancestry back into England, we have her parents with herself and siblings on census's from 1840 through to their deaths, but Sarah's marriage and death still elude us-and we have nothing beyond William's name for him.