This is what the person at findagrave said:
It's located in Wellington Township, Monroe County, Wisconsin on CTY HWY P and the closest village is Ontario. A number of years ago there was 2 seperate cemeteries St. Matthews Evangelical Lutheran Church Cemetery and Southridge. I'm not sure when they were combined into just Southridge Cemetery.
There never was a Southridge listed and she isn't listed under St Matthews, so it really threw me.