Welcome Chelsea -
I'm so sorry you're having to go through this. Addiction is especially hard on families and I can only imagine how you're feeling. Was your mother in any kind of program or rehab during her year sober (did she have any sober friends you could call?)
I'm glad you're here - it's really important to get the support you need, whether through AlAnon, counseling, or a site like this. While you're here, check out the section for Family/Friends of Alcoholics. There are so many who know what you're going through. (There's also a section for children of alcoholics).
Friends and Family of Alcoholics - SoberRecovery : Alcoholism Drug Addiction Help and Information