It depends.
Typically, you would need to file a nonresident VA return for your wife as she never lived there and resided in FL all year.
However, since you indicate the only reason for filing in VA was for the rental property located within the state and the rental property has no income for the year, she does not have a filing requirement (assuming it is only the rental property that needs to be reported for her in VA) as she is below the filing threshold.
Please see the following link for additional information on the filing threshold as well as the criteria for filing separately within Virginia.
Virginia Filing threshold
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