I am surprised they do not except the Census Records.Is it possible to find a death record, this will give you the proof unless her death record is in that same courthouse, then I can see your delima.
I do not have a Danser in my books. I do not have a Shahan in my books.
The National Archives in Charleston WV might be able to help.I don't know if you are close enough to go look there.They have Census Records, births and deaths and such.
Now, if your Mom or Dad is still alive, which ever is connected to your grandparents, they should be able to get that document, they have to present their birth record with grandmother's name on it or either you can.You just need to have proof up to grandparent, meaning your birth record, and your parent birth record showing name connections.