You have to ensure you take in sufficient and no more energy for the amount you expend in order to remain at the weight you wish. If you give up your daily tipple will you have a figure like hers ? Well shape is another matter, but weightwise if the reason you are heavier than her is that you drink so much alcohol it is supplying your over intake, then yes. If, on the other hand, once you stop drinking you are still taking on more calories than you need, then you will remain overweight, albeit at a lower level than now.