Exactly what could be gained from suing? Besides NO SALES and NO MONEY, they have NO ASSETS!
You would have to sue them as directors and prove that they acted in a corrupt manner (that might be easy, now that I think about it) and then drag their E&O insurance into it. I think that's the only insurance they maintained - to protect themselves! And, that says they have assets to protect. Perhaps Uncle Al does. He might be the deep pocket. With FL real estate, her second homes are probably under water if not foreclosed already. Getting liens on primary homes is useless.
(after posting this, I read the rest of the posts and saw you guys already covered my points... - nice to know we're all thinking alike.)