I am hoping someone will be able to help me. I have come to a standstill with a few of my lines and need help either with info or in looking up a birth certificate.

My gg grandmother was Nellie Catherine Keller. She was born in Hamilton County (most likely Long Lake) on 23 Sept 1847. She married Nelson Cary and they lived in Long Lake.
I know nothing else about either one of them. I tried to get a copy of her birth cert to find out the names of her parents, but was told I couldn't get anything prior to 1915.

Any info will be TREMENDOUSLY appreciated!!! Lauri