Copyrights belong to the author of the work. In film and photography, the author of the work is the photographer or director, if there is a person controlling both the photographer/cameraman and the subjects of the work. Copyright can only be assigned by written assignment. If you are the author of some of these works, allowing your ex to have possession is not the same has giving her copyrights in the works. You could still have an action if she copies the works without your express written consent.
Taking an action simply to do harm to another person (physical/emotional/reputation/etc) is actionable under tort law. Tort laws vary from state to state, but if she takes action for the clear purpose of causing you injury, you probably have a tort action against her. Similarly, if she has threatened to post/publish them, you could get an injunction to keep her from publishing them and/or to have them destroyed.
I have no idea how the state bar would handle the matter if you brought it to their attention.
Answered on Sep 10th, 2013 at 4:00 PM