It's a good thing Lisa pops in for a cameo each episode, otherwise people might start calling the show Stassi Rules.
Stassi obviously thinks she is entitled to inflict Punishment (her word) on everyone who dares enter her circle. It was unbelievable that she looked surprised and upset when Tom came at Jax, after she spent so much time and energy carefully orchestrating the whole debacle. Being on the show obviously feeds her narcissism and has turned her into an even more ugly, self-involved puppetmaster. The show would be so much more enjoyable if she just went away.