A New Jersey third-grader was banned from attending a school party because she opted out of the state's version of Common Core testing, according to her mother.

Michele Thornton says Oldmans Township School officials would not let her 9-year-old daughter, Cassidy, enjoy the end-of-year cupcake and juice box party. Thornton claims that the school officials said the celebration was only for students who took the Partnership for Assessment of Readiness for College and Careers (PARCC) exams.

Thornton said this is particularly unfair because she told Cassidy not to take the controversial tests.

"She shouldn’t be punished for something I did," Thornton told FoxNews.com. "She’s not a bad kid. It’s bullying. I’m not 9. They can’t bully me."

Thornton revealed that she picked Cassidy up early from school on Monday, June 15, while other students attended the party.

"When I went in to pick her up, there were two gaming trucks, an outdoor play area (soccer and volleyball), cupcakes, juice boxes and buckets full of prizes for the kids," Thornton said.

"She left school crying."

Thornton said the school agreed to launch an investigation after she complained. She received an email on Friday that read, "Mr. and Mrs. Thornton. The HIB [harassment, intimidation, and bullying] investigation has been completed. Findings indicate that harassment, intimidation and bullying did not occur."

Officials for the Oldmans Township School District did not return requests for comment, according to FoxNews.com.

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