I know a similar situation. A friend of mine who had two visits to the hospital from two separate wild trips to Vegas. He reported it to the FAA/his AME and had to go through the whole process of HIMS, took him a lot of money and valuable time. He always says he wished he never reported it to the FAA/his AME to begin with because the FAA never asks about hospital records. And he never drinks nor had a problem with stopping. The FAA medical application asks if you have an issue with substance abuse or dependency. If she has ever been diagnosed (by a doctor) with either of those then she needs to put yes. A person can play a dangerous game if they really do have a drinking problem, don't seek a medical advice, and lie about it on that form. Whether she has to or not go through the HIMS program, she will be able to get a 1st class medical.