I agree with this thinking...
Authorities haven’t ruled out anything but have settled on a working theory that the mischievous girl quickly made her way into the remote section around the Black Hills Children’s Home, tried to hide and became lost before freezing to death, according to several law enforcement officials
interviewed by News Watch in recent years.
While no individual has been conclusively cleared in the case, investigators said they do not believe a stranger or neighbor abducted her or that any member of her family or the facility had a hand in her disappearance.
Their doubts about a possible abduction arise largely from the fact that a woman and girl were in a car at the Black Hills Children’s Home and saw Serenity run away, then drove up and down Rockerville Road after her a few minutes later without seeing her or anyone else.
“I can’t even begin to calculate the odds that someone who would be willing to violently abduct a child happened by on a rural western South Dakota road within the few minutes they had to do that and successfully abducted her,” then-sheriff’s detective Jamin Hartland said in 2020.
AND
... Gentry said it seems likely that Serenity found a hidden final resting spot.
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