The property isn't privately owned. It's owned by the City. Plus, the lease is written up by the Housing Urban Department. And by law, by the HUD standards,
Secton 9
Occupancy of the Premises and Tenant’s Obligations
Tenant SHALL:
Not permit household members or guests to act or speak in an abusive or threatening manner.
Section 10
CRIMINAL ACTIVITY
Criminal Activity includes, but is not limited to, any of the following:
Physical assault or the threat of physical assault, Illegal use of a firearm or other weapon, or the threat to use a firearm or other weapon
Sexual molestation, sexual molestation of a minor, prostitution,and other similar or related sexual misconduct.
Any breach of this lease provision by the tenant, his/herhousehold member(s) or guest(s) shall be cause for termination of the Lease if PMHA believes, in good faith,that a breach has occurred.
A breach of this covenant constitutes a serious and clear danger to the health and safety of other tenants, persons residing in the vicinity and employees of PMHA. It shall be PMHA’s duty, in any eviction proceedings, to prove that a breach of this covenant has occurred.
So, yes, it's easy as I think, because she has broken her lease agreement by law, and 4 people have signed an statement that the incident occured.
http://www.hud.gov/offices/pih/progr...phtraining.pdf