First off let me applaud you loudly for taking this step. ManyMany in similar situations are too ashamed to admit it to others. YourYour mother is one example.
Unfortunately, this is a large complex problem, which we can help only minimally online.
Google abused"abused women help Whichhelp" - Which resources look useful to you?
In the United States, many cities have shelters for abused women. Contact the closest one. SheShe needs to know that she has options- there is another way to live.
I am not an expert, but apparently getting the police involved lessens the risk to her in sometimes. http://www.lib.jjay.cuny.edu/research/spousegetting the police involved lessens the risk to her sometimes.html
Other resources Join a Codependent's Anonymous group or similar. Many churches are:
- Join a Codependent's Anonymous group or similar.
- Many churches