Movies like this are a primary reason so many people hate those ephemeral films of the pre-war and post-WW II era.
Susan Jane is somewhat pretty by early-1950's standards, but she's not exactly a social butterfly. The kids at school never invite her to parties or engage her in conversations, although they don't seem to have any reason for it. Actually, I think the girl who plays Lois was better looking, but that's neither here nor there. Unable to make her way into high school society, Susan goes home from school in tears. Mom tries to help, but she doesn't have a clue about things work among the kids. All the while this female narrator, who's a lot less condescending than the bitch in "Habit Patterns" three years later keeps telling her she's getting all worked up over nothing, which in this case turns out to be right. Though some of the boys think she's stuck-up, two of the girls try to go out of their way to convince her and her mother that they're okay with this girl, and she's genuinely invited to the party with no strings attached, no hidden agenda, and no ulterior motive. All she has to do is believe it.
The more likely scenario would be a somewhat more sadistic version of what Mindy McCready went through on her disastrous first date in "Kick-Ass 2," and Susan Jane wouldn't have had the advantage Hit Girl's father's old crowd control shock baton to make her enemies puke their guts out. Some may blame it on rigid-1950's conformity, but the truth is that kind of rigid conformity in our schools happens in every decade. And the outcome is rarely as happy-go-lucky as movies like this make it seem. Not then, and not now.