This would be an extreme long shot. But what about this UID:
The National Missing and Unidentified Persons System (NamUs)
Honestly the only reason I am really suggesting it is because of the reconstruction. I saw it and immediately thought of Gail.
Date found: April 11, 1976 in Los Angeles, California.
1. Age: 18-25. Gail was 13 in 1972. If she was kept alive between 72-76, she would have been 16 almost 17. Not a match but close.
2. Height: UID is listed at 5'3-5'8. Gail is listed at 5'0. Within the limits, I went through a huge growth spurt right after I turned 13. So it's possible.
3. Weight: UID is 130-150. Gail was listed at 100. Not a match but could have gained the weight in 3 years.
4. Hair: UID is listed as Brown. Gail is listed as blonde/Brown.
Match
5. Eye color: UID is listed as Brown. Gail is also listed as Brown.
Match
Really it's only the photo that made me pause and look at it. I have no explanation on how she would have ended up in CA, not been in contact with her family for those years. But I also know that stranger things have happened.