It's been more than 2yrs since the last post for Shirley. If Sarah or Penny still visit this thread, were there ever any updates on the DNA testing? Was it added to CODIS and NamUs? With all the new family tree databases, have you done your DNA through any of them? If so, may I suggest that you upload to GEDmatch and DNAsolves, if you haven't already?
I've read this thread, the Vernon Jane Doe thread and Sarah's blog. My heart breaks for your family. I'm definitely not an expert at researching, but I'd love to try and help!