". . .some these lauded experts claim she CAN be rehabilitated."
Then why don't they offer to do so?
The husband can no longer afford to pay them, but this should make no difference to them, as it's apparently a matter of principle. If they can save her, after 13 long years of no response, they would make medical history.
Also, since the State of Florida has seen fit to, in essence, take over her care, maybe they will also be willing to take over the practical details of her care. In perpetuity.
Regards--
Mary Anne