“She’s annoying,” yes that’s the point. She’s not supposed to be likeable, she’s supposed to make you reflect on Mr PB and why he likes her, and why we like PB but not her. She’s also supposed to be the opposite of Diane. Nothing about her is supposed to be likeable, though. And I think she is perfectly written to accomplish that. She’s not a terrible person, there’s nothing super wrong with her. There’s no shortcut to make you dislike her. All the reasons to dislike her are completely valid reasons: she’s immature, she’s loud, she’s oblivious, she’s selfish in that way that isn’t intentional, she just doesn’t have the emotional maturity to think about people around her.