This is an odd case. Apart from the usual listings on missing person sites there is nothing out there. Whilst this is hardly unique, it is surprising when there appears to be a large family still alive, including siblings, nephews and nieces, and possibly even parents. One mystery appears from entries on Ancestry. Margie appears in two family trees on Ancestry; one belonging to Ashley Copelin, who is listed as a niece on the obituary of Mark Ranshaw (Margie's brother) in 2007, and the other tree is from Christie Ranshaw, whose relationship to Margie is unclear. Both of these trees show that Margie was married at some point (or had a partner) and that there was a child. More confusingly, the Christie Ranshaw tree names the child as Ashley Copelin, who has the (married) name of Margie's sister and is shown as the sisters daughter in Mark Ranshaw's obituary. So there appear to be three possibilities;
1. The trees are wrong, either about the existence of a partner, a child or both. But since one tree is by Ashley Copelin such a gross error seems unlikely.
2. The identification of the child as Ashley Copelin is wrong, but there was a child. This is possible as the existence of the child is shown in both trees but only named as Ashley in Christie Ranshaw's tree.
3. The trees are correct and Ashley is the child of Margie and was adopted by her sister.
I do not know the answer but if there was a partner it would open a new area of interest. The identity of the child is less significant to the case but, of course , if a child was confirmed it would reinforce the question about a partner.