after gerolds confession, sheila is described as looking at gerold "almost in triumph" because she belives the inspector is aware of gerolds affair. this stage direction hints at sheilas anger towards gerold. it suggests she's pleased that gerold will be judged by the inspector , regardless of the potential consequences for the upcoming wedding and reputation. you could also argue that it shows how, even early on in the play, sheila has already decided to side with the inspector