Thanks for your interest in helping me. I never did learn more about Seydel's actual location.
I have learned so much more about Maggie in the last seven years, I expected to never learn any more about her working in Johnson Co., and it isn't so important to me anymore. She may have just answered an advertisement to work for them. She had previously lived in Cedar Rapids. She did meet her husband that year (her brother worked for him as a hired man also in Oxford Twp.) and they were married in September. So maybe she was there because of him working there.
1870 John Seydel lived in his parents household in Iowa City. 1880 his farm was located in Oxford Twp. I know many farms were rented at this time, also.
So thanks for trying to help! DiAnn