Check womenslaw.org

Some states go above and beyond domestic violence laws permitting a lease to be broken without penalty. It's worth checking if your state is one of them.

It's likely worth talking to your landlord as well. Ask for specifics about taking one person on the lease leaving and one staying. Penalties for breaking a lease are usually incurred because the landlord loses rental income. If one person is staying and paying the rent, there shouldn't be a penalty.