Up until this episode I've thought this show to be one of the best I've ever seen. It's felt so real. Alex's success of getting a new home and a good preschool was obviously too much for it to storywise make sense not to ruin it somehow. But to ruin it this way is completely nonsensical. As pointed out by another reviewer, it goes against what we've seen of Alex's character so far. She cares about Maddy's wellbeing more than anything. She had every opportunity to set her foot down and say "no, no booze at my daughter's birthday party!". Just utter nonsense that she would jeopardise her new found home in this way. Disappointed.