What about
Niki Diane Britten?
"Niki ran away from her home in Albany, Oregon on July 16, 1969. She was living with her grandparents at the time of her disappearance. They legally adopted her after her parents divorced; this was supposedly to ensure that Niki's father, who was allegedly abusive, wouldn't get custody of her.
Her mother, Nancy Mahaffey, remarried and moved to Pennsylvania, leaving Niki behind in Oregon; Niki began running away after that. For a time in 1966 and 1967, she stayed at Hillcrest, a juvenile correction facility.
Niki called family friends in September 1969, trying to get in touch with her grandparents. She said she was in New York, had a job and was all right. This was the last time her family heard from her. Her grandparents kept the same phone number for the rest of their lives and never changed the locks at their Albany home, in case she should come home or try to contact them."
Jane Doe had a phone bill with calls to several parts of PA and NY/NJ. Maybe contacting her mother or trying to track her down?
She'd be a bit on the young side, though, as JD's estimated 18-30, and on 12/31/70 Niki would have been 16 and a half.