Bumping for Kathleen, especially since I had a friend move to Springdale earlier this year.
A few more thoughts I had here...
I know someone mentioned they knew Kathleen on here. Have we tracked down any close friends? She certainly would have had some in the area, especially since I'd assume she attended the local public school. We know the home life is bad, but maybe she confided to someone about it.
There's also the possibility that she wound up staying locally. Yes, she's at a crossroads with I-76 and PA 28, both of which we've mentioned before as close connectors to I-79, I-80, US 19, and I-70 (meaning quick access to points across PA as well as OH, NY, WV, NJ, and other surrounding areas). I-90 is only a few hours away as well. Still, what if...she was kept somewhere in Pittsburgh and raised under a fake identity?
The old obituary of Annabell Kelly from 2009 was something I had brought up earlier. It still mentions her as alive, so maybe they know something we don't?
Kathleen would be about 50 years old now and could honestly be anywhere under any identity. The more I think of it, the more I thinks she orchestrated her own disappearance, and part of that is because she seemed to have many older figures in life and likely knew her way around because of it. Having grown up with older influences myself, I can state firsthand that you're more aware of how the world works if you have teenagers, college kids, or adults in your life more than you have, say, a younger sibling or just a peer group.