There seems to be two possible outcomes depending on the particular state's laws.
If the states follows the common law, at the time they become legally separated (and both parties have notice), the wife no longer has ownership of the husband's property.
She has an equitable interest but not a possessory interest. (Pending a subsequent division of the property)
In this situation her breaking into his apartment is no different than her breaking into the apartment of a stranger who ran her off the road.
If they are in a community property state there is no such thing as "legal separation" They are married until the divorce becomes final.
The wife has both a possessory and equitable interest in all assets of the community estate. (including the leasehold interest in the husband's apartment)
In a community property state she has likely done nothing wrong.
(There are narrow exceptions where one can have separate property outside of a community but these are somewhat rare and not likely to apply here.)
Note: Florida is a Common Law state