Just say no
This is a very supportive sign, and it’s clear that this friend is very supportive, but perhaps she should have 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 this sign seems to lack 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 could have saved the congratulations for a more private moment. A simple “welcome back” sign would have sufficed, in our opinion.