Searching for Christine, born in Jan, around 1967, in San Diego

Hi, I'm helping my partner search for his half-sister. His mother gave birth to a baby girl at Sharp Hospital in San Diego who was then adopted. We have very little information about her except for the following: 1. Place of birth: San Diego, CA 2. Date of birth: January, around 1967 (give or take a year or two) 3. Ethnicity: White 4. Gender: Female 5. Birth Mother's name on record: Linda Miller 6. Adoptee's name on record: Christine Miller 7. Birth Father's name: Chris, no last name, and we don't believe she used his name on any record 8. Hospital: Sharp Hospital in San Diego We are not sure if she knows of her adoption status or if she does, if she is even interested in finding her birth family. Unfortunately the birth mother is deceased but her family would be very interested in connecting.