Hi. My mother was born in Vananda in 1925.
I’m trying to find out how to get a copy of her birth certificate.
She passed away several years ago. I’m just searching for any information. Her maiden name was Schlecht. And her Mothers maiden name was Sour.

It looks like you can apply for a Birth Certificate on the following website:
https://dphhs.mt.gov/vitalrecords

You can purchase your or a deceased family member's Montana birth certificate at any Montana county courthouse or from website prev posted.
Are you looking for info on Norma E Schlecht, found in 1930 Vanada, MT census? I believe her mother Lydia's maiden name was Saur. On census it indicates she was 3 yrs old..so birth year closer to 1927.