According to Ancestry.com, Sindy Gina Paris was her name and her parents were named Louis Paris and Esther Virginia Rodriguez. She lived in Tarrant, TX where she was born. I don't see any evidence of her ever having lived in California. She was married a few times before she married Phillip. Her first marriage was when she was 19 in July of 1976 to a guy named Stephen C. Born. She then got married a year later in July 1977 to Larry Keith Robison. After this, she was married in Feb. 1979 to Dale Alan Mitchell. Finally, she married Dwight Phillip Crow in 1984. Her daughter Margo says that her birth certificate listed her mother's name as "Elaine Ann Mitchell." Maybe this had something to do with her husband before Phillip being a Mitchell, but that doesn't explain the Elaine Ann part.
Interestingly, apparently her second husband Larry Keith Robison had a psychotic break due to schizophrenia in 1982 and killed 5 people in Tarrant County, TX. He was executed for this in 2000 and was the subject of controversy because of whether or not it was acceptable to execute those who are mentally ill.