I googled the yacht scenes from that or another holiday and Sonja complains it smells of cat piss which apparently is what meth smells like?! I read it on Reddit, it could explain Kelly as she was absolutely unhinged?!I think the only thing that came close to that episode where she had the breakdown on holiday somewhere was the NY crazy island one with kelly, but as far as whole storylines go I def don't think so!
Although interestingly Elle Mac who married her ex is now married to the awful anti vaxxer leader who puts kids at harm so clearly that set are all fucked