Get out while you can, and put your energy into developing relationships with people who treat you with respect. If there are charges pending against your ex-lover, taking part in the legal process can be very empowering. You may also want to obtain a restraining order against your ex-partner. Some women have found restraining orders highly useful, others have felt their lover became even more dangerous and violent after a restraining order was issued. Contact a domestic violence shelter.
Many shelters offer free counseling or support groups to women coming out of violent relationships.
Some shelters in larger cities even have programs sensitive to or directed specifically towards lesbians. You might want to consider staying at a shelter for a while after leaving a violent relationship. Decide what level of contact with your ex-partner, if any, is acceptable. Based on your decisions, be prepared to make some life changes. If you want to avoid all contact with her, you will probably have to avoid some of your favorite places.