A Couple of things that you may have already tryed.

On Ancestry in the Birth, Death, Marrage sections there are:
Wisconsin Marriges pre 1907
Wisconsin Births 1820-1907
Wisconsin Deaths 1820-1907

These are indexes. But from what you said you only have her maiden name not her married name. If you can find her marrage record that would give you who she married as well as the name the children were born under thus giving you the name to look for the birth record for and with her husbands name you could find his death date to give you a better picture of the family.

If they are not in the indexes which is possible, try searching for a marrage notice in the newspapersor any other place you can think of it could be the key to find the people you are looking for.