If your dead broke and don't give a fuck about anybody but yourself than tell her to fuck off.
Personally, I would give her everything back if you haven't already sold it. If you have, don't sell anymore. But, at least make her pay you the money back if she can. What's that one shoot really worth to you anyways? Is she drop dead gorgeous and going to make you a multimillionaire on the hottest new solo-girl site or something?
On another note. Stories like these do get heard by others and probably don't help the adult industry at all. Picture the headlines...
"Pornographers taking advantage of teenage girls with drug problems, tonight on 60 minutes"
p.s.
my statement is based solely on reading just her first paragraph.