Looking for Charlotte Gage Born 1814 IN Upper Canada and Married Roswell Seaton IN 1837 IN Ontario Canada

I'm trying to get birth information on my gggrandmother Charlotte Gage as well as death information on her.
The last information i have is her with her daughter Rosan Seaton Bickle in Sanilac Michigan around 1880
DNA results indicate her parents were Thomas Gage and Ruth Mosher however I have been unable to locate her birth certificate to confirm this