This is one of the reasons a woman may choose to stay in the violent home. Be with her in her suffering and in her healing. Do not stand withdrawn from her. Acknowledge your fears and pain as you hear her stories. But also praise her as she moves toward wholeness.
Confidentiality is of utmost importance.
She has come to you because she needs your help and trusts that you will be willing to help. That which she shares with you must be kept confidential. Unless you have her specific consent, you are ethically bound to tell no one. The decision to pursue therapy is hers to make. Not all battered women will wish to or need to seek therapy.