She lied again 2 nights ago?

Ok. The night before last I went to my GF's place to surprise her with my presence after she got off work, and she wasn't there. Not normal for her as far as i know. I waited there for a couple hours when she didnt show up. So the next morning I asked her what she did last night, and she said I got off work , and watched TV then went to bed. At that moment I knew she was lying again. She has a history of alcoholism. So i checked her bank account. Low and behold she had been at a bar for several hours. She even tried to turn things around on me to make thing seems less profound that she had lied to me. Her story changed about three times. First it was, I went to the bar got food , and came home. Then It was I went there had a beer and went home. Then it was I went there had 2 beers and food watched a basketball game, then went home. By the way she hates basketball, and the four years we have been together , have never watched a quarter of basketball. Funny thing is that she always got mad at me if I wanted to have some drinks. Now she says she feels so so bad. And I love you so much I would never do anything to hurt you. I know it's just because she got caught. I think she is still lying about what she really was doing at the bar. Should I dump her? I think I should.