Maybe...?
Unidentified Person / NamUs #UP7765 Female, Multiple
Date Body Found July 24, 1976
Location Found Linn County, Oregon
Estimated Age Range 18-40 Years
The skeletal remains of an unidentified female were discovered south of Oregon State Hwy 20, near Swamp Mountain Road in the Cascadia area outside of Sweet Home, Oregon.
By bringing people, information, forensic science and technology together, NamUs helps resolve cases.
www.namus.gov
This Jane Doe has clogs, but not red:
View attachment 548755
Date of death sometime between 1966 &1976. They're saying Caucasian and also American Indian/Alaska Native. Height estimated at 5'0" so unless that's considerably off, this can't be her. But they only had a partial skeleton and list no weight.
This Jane Doe had a leather coat with fringe, I would take it the type of coat you'd wear during a colder season in these areas. But evidently not the dark blue corduroy jacket that's listed on NAMUS for Robin. This Jane Doe had a 29" inseam on her Levi's. I'm seeing a 29" inseam is for someone say 5'6" or shorter. Hmm. Checking multiple sources, that inseam would appear to be right from someone of Robin Graham's height.