I'm busting in too, first time posting on this site! Just stuck to this case for Philly reasons (not that we don't have *many* missing people, unfortunately).
I work in public services and am all around Philly so I know there is still a substantial Polish population in Port Richmond; I actually know a family that moved from Poland last year. I don't know how closely knit newer residents are though ... though many come over bc of extended family. And if you're overstaying your visa ... There are large populations of newer Russian and Ukrainian immigrants but a bit farther Northeast (Bustleton, Somerton). Not on the Delaware but really not far ...
Here's where she was found from a
very short clip on local news the week she was found:
dd (Kensington basically flows into Port Richmond with drug problems, down E. Allegheny and the riverbank). It's industrial as you see. In the clip they say cause of death not yet known. But I can't find any later follow ups.
Re: the running/athletic clothing, unfortunately if you look at any of the Kensington Beach pages (just did) you can see lots of young women in more athletic clothes. Looking like suburban girls ... It's all really sad to see.