I hope so!
Not the best developed theory. I'm really just throwing my thoughts out there.
Another one was to wonder if those schools for "troubled kids" were common then? (I think they might have been? ) Similar to the one Paris Hilton spent time in, and called out. Could WCJD have been a troubled young girl from a family who was fed up, or hiding behavior they were embarrassed by?
The cold case I am reminded of here is Julie Soracco, whose grandfather was a prominent physician in the small town where she went missing from, and apparently did not want her case publicized at the time. Julie had been in a foster situation, and for anyone unfamiliar was not reported missing until July of 2019, even though she went missing around August of 1977.