The Pre-1907 Vital Records are available at the Wisconsin State Historical Society and show the likely husband of Elizabeth Page as M.B. French. You can order a copy of the record via their website.
Also, there is a Sarah Page living with Abram Page in Leeds, Columbia County in the 1870 census. Abram was listed as the eldest son in the 1850 census. She is shown in the Ancestry transcription as being 14 years old but appears out of age sequence and with an occupation of Ret. Housekeeper. I believe the age of 74 was picked up as 14 in error. If you look at the way the enumerator writes his numbers it is a 7 not a 1 as the first digit. Parents residing with their children were usually listed after the children so it makes sense this could be your Sarah. It lists her place of birth as Wisconsin but that would be an error for someone 74 years old.
Hope that helps.