If she’s not willing to get some muscular friends to persuade him she should sell the place.
In theory, all she would really need to do is arm herself, visit her property, and then do what any citizen has a right to if she feels threatened on her own property.
No elaborate schemes required.
And she can't really sell the place: few people are going to buy an apartment at market price when it's occupied by a belligerent criminal in the middle of an eviction proceeding.