Here's another mid-1970's Female MP from Oregon just added to NamUs who fits the description of the 1976 Linn County Jane Doe.
Cherril Sue Miller
https://www.findthemissing.org/en/cases/13680/4
Her height (5'0" to 5'1") is spot-on. Her age is within range. She went missing in October 1975 in Portland OR (less than 100 miles from where the remains were found) found.
Her NamUs page indicates that she had "one discolored or capped tooth in front of mouth". However, we can't verify that to the UID because the upper-front teeth (as well as most of her teeth on the upper left side) were missing postmortem.
Her clothing and purse description doesn't match though.
ETA: I just noticed in the dentals section that the Jane Doe's dental age is estimated at 17.7 (plus or minus 1.8 years). This would tighten the Jane Does age estimate to somewhere between 15.9 years old and 19.5 years old.