Can you offer Shadow a home? The information I've got so far is that she's timid but loving and is currently very vocal. This might be because she's unspayed, as I can't get confirmation one way or the other.
However, Ela has kindly agreed to organise a full cost spay voucher for whoever takes Shadow in and gives her a loving home.
She sounds lovely and if I could afford it I'd take her myself. I love pure black cats!