DO Believe her. Encourage, but don't pressure her to talk about the abuse. Respect her need for confidentiality. Listen to her and support her feelings without judging her. Let her know that she is not alone.
Domestic assault happens to many women.
Reassure her that the abuse is not her fault. She is not to blame. Her physical safety is the first priority. Discuss her options and help her make safety plans for herself and her children. Give her the time she needs to make her own decisions.