Semele thought they were all making the things overly complicated themselves. They clearly just needed to relax a little. But she wanted to be helpful... or something close to it. "How about we go out? Close up the bar and we'll go dancing!" From her pocket she pulled out a little baggie of white powder. "I've got coke!"
The idea that Ariadne couldn't just close her own bar at a moment's notice on a Saturday night and shoot off to do drugs in the backroom of some deafening club was completely lost on Semele.