I first need to state that this information is not yet confirmed to be "our" Elizabeth Dunzinger, but the timeframe and location are correct. I MAY have found Elizabeth Dunzinger's family in New York.
What we know for sure up to this point is that she appeared in the 1870 census in Des Moines County, Iowa, living in the Charles Wagner household in Burlington. She was listed as 17 years old, a servent in the boarding house Mr. Wagner ran. We later figured out that this was the Valley Street Boarding House located at 413 and 415 Valley Street in Burlington, Iowa.
A second cousin of mine showed me a newspaper article that her grandmother had noted that it spoke about relatives of Grandma Panther, meaning Lizzie Dunzinger. The people the article talked about were from Wemding, Bavaria, Germany.
We have found Dunzinger families in Wemding. We just haven't been able to connect her to these families.
I just received the most recent newsletter from Family Search, which touted that new collections are added each week. The email contained a link to their online collection. I browsed down the list and found the 1855 New York State Census and did a search. A search for Dunzinger returned this family in New York City, New York County, Ward 20, Enumeration District 2:
Andrew Dunzenger - M - 32 - born in Germany
Fanny Dunzenger - F - wife - 27 - born in Germany
Mary A. Dunzenger - F - child - 4 - born in New York
Elizabeth Dunzenger - F - child - 1 - born in New York <----- This could be her!
Victoria Sualemar - F - 68 - mother - born in Germany
Adam Pacoke - M - 16 - brother - born in Germany
Our information said she was born in either 1854 or 1856. If she was born in 1854, the age would be correct in this census. I believe the next step would be to find Andrew and Fanny's marriage and/or immigration record, and, to confirm family stories, to see if they died in the next few years.
It's possible our most frustrating brick wall may finally be crumbling!
edited 01 June 2013 - changed sister name from Margret to Mary A.