My mum is an alcoholic. She drinks 2 bottles of wine a night, 7 days a week. Is that bad?

That amount of alcohol consumption is not safe. Check out this website where you can do an anonymous assessment of your mom's drinking patterns and better judge for yourself: http://rethinkingdrinking.niaaa.nih.gov/ .

There is a great deal you can do to help yourself even if your mom chooses not to stop her drinking. This website talks about addiction: www.hbo.com/addiction, and this one talks about things you can do to help yourself: www.breakingthecycles.com.