It sounds as if she may b e misusing the pictures that she obtained. Florida is a no fault divorce state, so she didn't need those pictures to prove anything for her divorce. You should see an attorney in your area to determine whether or not you should file for a restraining order or consider some other remedy - it sounds as if a number of options may be available.
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Speak to a lawyer asap and discuss a possible Injunction against Stalking.
This information is a general answer and is not specific to any particular case. Carin Manders Constantine, Esq. 727-488-8272 Services offered in Pinellas, Pasco, and Hillsborough Counties. https://www.facebook.com/pages/The-Law-Offices-of-Carin-M-Constantine/125967577416313 http://www.linkedin.com/pub/carin-constantine/b/861/445 If you find this Answer helpful please make sure to indicate that on AVVO.
So long as the pictures where taken where you have no right of privacy and not used for a commercial purpose, she can publish them to third parties. Having a malicious intent is irrelevant. The ultimate defense to defamation is the truth, and here, you all know the truth.
The true question is does this rise to the level of blackmail? I don't think so, but your best bet is to discuss the issue with either the State Attorney's Office or local law enforcement agency.