Family unwilling to submit DNA always leaves me thinking they have something to hide. Even if one was paranoid about the gov't using your DNA or having some other odd theory, this is your family. How could you NOT want to help in anyway possible?
I know we can't sleuth family members but it does make one wonder. Does her family have a criminal background, drug dealing history, domestic violence or something that would make their fear override the kindness of helping?
Let's hope someone in that family tree has tested and the genealogists can eventually work their way into IDing her. I know there's people in my line that will never test. But oh well, too late now because I did and there's a murderer on one branch.