start with https://www.cdph.ca.gov/Programs/CH...aining-Certified-Copies-of-Birth-Records.aspxMy housekeeper ask me this. Her mother was a migrant farm worker. Soon after her birth another family unofficially adopted her. She believes she was born in August 1998 in Southern California or Arizona but she is not sure. She is afraid to go to an immigration office because ICE is monitoring the offices. She ask me if there was a state or national database where she can search for her birth certificate.
If those don't work she can try to go through an arcane process that could need a lawyer or a congressional caseworkers help. It may involve tracking down people who knew her mother when and where she was born; seeing if there is any evidence in family bibles; see if the school she first attended still exists and has anything. There is a work around process that is a hold over from the days of black hospitals or home birthing where records no longer exist but she needs to start working on it. If she waits until she is 65 it may be too late.