Good find on the adultery statute. Unfortunately, it's more complicated than this.
Florida is a "no-fault" divorce state. You only have to state the marriage is "irretrievably broken".
However, who would file the divorce papers for her? Her legal guardian. But he is the guardian. Yet another conflict of interest.
And how can he file for dissolution of marriage if she is under his charge. It's checkmate, as long as he remains the guardian.
I wasn't offering a remedy to this travesty of justice. The courts, legislature and executive branches have their own reputations in their own hands. It's clear to me the system is dysfunctional; but then again, plenty of people on FR have referred to me as misguided, stupid, and ill-informed. Fair warning, don't take my word or opinions as having any particular degree of value. Instead, think independently. The world works better that way.