Abuse

Hello people (:
I have a huge problem & I would love your help.
My cousin who lives in Mexico with her husband and her two kids gets abused by her husband nearly everyday. Physically & emotionally.It gets me really sad that she goes to me for help when I honestly dont' know what to do. I try to tell her that telling my mom is best. Because about 2 years ago she lived at my house for 2-3 months.My mom picked her up from were she lives and brought her here. She is always welcomed at my house. What can I do to convince her that letting my mom know is the best thing to do? She is suffering a lot. She doesn't really have a very supportive mother. I think my family can help her out. But she doesn't want me to say anything. I also don't want to lose her trust.. Because we trust each other with everything.She's suicidal, she says that her kids would be better if she was dead . & that's not true they love her a lot. I just wish I could help. Any ideas of what I can do?
Please & Thanks you
-NicoleT