Question about the 1976 film Carrie?

In the scene where a girl confronts Sue over Tommy taking Carrie to the prom, Sue says 

“I asked him too because I thought I owed it to Carrie.” 

And then the girl says “And where’s that put everybody else?” 

And Sue says “They’ll have to deal with it in their own way.” 

What did the girl mean in asking that question? How did Tommy taking Carrie to the prom affect anybody else at the prom? 

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