What would you do?

So say a friend told you that her mother is continuously abused by a man that she leaves and gets back with constantly. And to add to that has two young children that have gotten hurt before. 
Say said friend told you not to say anything because she's not ready to do anything about it. 
Could you sit there and do nothing like your friend wants you to, or go ahead and try to protect all involved. Especially the kids since the mother won't leave this man to protect them. 
Just to add say you've been friends with this girl for almost two years and this has been happening for that whole time. 

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