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I am sorry to learn of this situation.
This is a very difficult situation. However, there are a couple of things that can be done.
Ann's boyfriend can (and should) continue to follow up with the County Prosecutor's office and the police department to ensure that battery charges are filed and prosecuted against Jan.
Ann can request a civil restraining order against Jan (she can get information on these orders from the District Attorney's Office Victim's Assistance division, as well as the County Law Library, and the TX Attorney General's Website). But given that she is already working with local law enforcement, I would recommend that she start there.
Ann can also request a civil restraining order against Jan's parents if they are making threats against her. Furthermore, these individuals are not on the lease, and they should not have access to the apartment. The landlord has an obligation to ensure that the unit is secure against non-tenants and should rekey the unit providing new keys to both Ann and to Jan clearly labeled "DO NOT DUPLICATE" so that no licensed locksmith will make second copies.
If Jan's parents come to the property without Jan being present again, Ann can contact law enforcement and report them for trespassing. If they threaten her she should contact them using 9-1-1.
Unfortunately, as to dealing with the lease, while Texas does have a Domestic Violence lease termination provision, the statute is drafted narrowly, allowing victims of domestic or dating violence to terminate a lease without penalty. It does not allow other co-tenants who are victims of violence to similarly terminate their lease. However, this does not mean that all is lost.
The two roommates can terminate a lease early, and the landlord has an obligation to try to re-rent the unit (the current tenants are liable for rent until (1) the end of the lease term or (2) until the landlord finds a new tenant using reasonable efforts). Most courts limit this period to 2-3 months (this is a "rule of thumb" and not intended to substitute for the legal standard identified above).