My understanding is that these pics were of some nude modeling shoot she did when she was young, not something done without her knowledge.
Did she not sign some sort of contract and get paid from the original job? I don't see why a court would stop this guy.
The extortion might be a different matter. "Give me $3 million or I will sell these" would get him in trouble. But what if $3 million was what he was offered by some magazine? "Top their bid of $3 million or will sell them" doesn't seem like extortion to me.