Just say no
This is a very supportive sign, and a very supportive friend, but perhaps she should’ve kept the slogans for a more private situation. A drinking problem, or any other addiction, is a private issue for people who are struggling with it, and so this sign seems to be lacking some tact.
You can tell she put a lot of thought and effort into this poster, but while her heart was in the right place, she should have saved the congratulations for the car. A simple “welcome back” sign would have done the trick, if you ask us.