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It was an elementary case for a child not even in elementary school.

A 4-year-old Ferndale, Washington, girl foiled an alleged robbery plot by her 17-year-old babysitter on Wednesday.

Like Roger Murtaugh being "too old for this sh*t," rookie detective Abby is already dealing with the stress of locking up alleged criminals.

"Wednesday was the worst day of my life," the little girl told Q13 Fox News.

Police said the girl's babysitter, who is not being named because she is a minor, planned a false home invasion in order to steal things from the residence. Her alleged accomplices included her 16-year-old boyfriend, and 18-year-old Ruben Benjamin, according to Fox News.

When officers arrived at the apartment, the babysitter allegedly told police that two armed black men had entered the residence and stolen things including a video game system, laptops, and Abby's iPod and piggy bank.

Investigators said the babysitter even tried pinning the crime on a black neighbor, who was taken in for questioning, according to the New York Daily News.

But when officers spoke to Abby, the little girl told them that the robbers were white, not black, and that they had ordered the little girl out of the house in order to steal.

A short time later, police said the suspect admitted to the crime. The babysitter and her alleged accomplices were all arrested.

The babysitter now faces charges of second-degree perjury, conspiring to commit robbery and conspiring to commit burglary. The two other suspects were both charged with second-degree robbery, theft, and burglary.

As for Abby, she told Q13Fox that she was just happy to have her stuff back.

"[Police] got it back because of me being the superhero," she said.

Abby also had some pretty strong opinions about her now former babysitter.

"That was really her being bad," she said. "She's not a good babysitter."