I am going to go on my own tangent here, and suggest a possible MP as Walker County Jane Doe, even though she is not a perfect match height-wise.
Tammy Rose Surdam.
She went missing in 1979, when she was 12. She was a notorious run away, and been hanging out in some not so good crowds since sometime in 1977. Anything from 1-2 years before. Family described her as "too trusting." Maybe it was just her being naive. It is suspected she met with foul play at the hands of a man who admitted to killing a 12 year old. A Danny Williams, who was accused and put on trial for the kidnapping and presumed murder of Gina Brooks 10 years later [This happened in 1989]. Leaving a big ol' 10 year gap.
She is listed as having blue eyes, but her image certainly looks more hazel than blue. [Hazel can also appear blue, it is an odd color]
However her height is listed as 5'10, which I find to be an incredible height for a 12 year old, but it is possible .
My second suggestion for Walker County Jane Doe, is Khymberly Marcella Scruggs.
She went missing in jan 1980 from Sacramento, California.
She was 19 years old
5'6''
115 lbs
Her nose really reminds me of WCJD for some reason.
Eyes are listed as: brown
She had a chipped front tooth.
I can't see either ruled out on NamUs, but perhaps that is not a comprehensive list of comparisons.