The mother of a graduated Georgetown University student pleaded guilty in court on Monday to charges alleging that she paid $9,000 to the company of Rick Singer, the admitted engineer of a nationwide college admissions fraud scandal, to get her son out of taking all the necessary classes to earn his Georgetown degree.

Karen Littlefair paid Singer to provide an individual to take online classes in place of her son, earning him credits necessary to graduate, according to charging documents in the U.S. District Court of Massachusetts. Individuals employed by Singer took classes for Littlefair’s son from 2017 through about April 2018, the documents say.

Littlefair, who is from Newport Beach, California, pleaded guilty to one count of conspiracy to commit wire fraud, according to a press release from the U.S. Attorney’s Office. She is the 53rd parent to be charged in the case, which involves dozens of wealthy parents—a few of them famous celebrities—who paid Singer to help their children gain admission to prestigious universities.

Littlefair’s case differs from many of the others, which involved Singer helping the children of wealthy parents cheat on admissions tests or earning them admission via college sports, even when the student in question was not a competitive athlete.

Two other students at Georgetown, whose parents have also been charged in the scheme, appear to have earned admission to the university largely based on their status as college tennis recruits, when neither of them played competitive tennis. Former tennis coach Gordon Ernst has been charged with accepting bribes to list at least 12 of Singer’s clients as tennis recruits, earning them admission to the university. Georgetown has confirmed to DCist that it dismissed two students from the university as a result of these allegations.

Littlefair’s son was already a student at Georgetown when her involvement with Singer began, per court documents. Starting in June 2017, Singer and Littlefair began exchanging emails to organize the classes Singer’s associates would take for her son. A person employed by Singer took at least four online classes for Littlefair’s son, three offered by Georgetown and a fourth offered by Arizona State University.

One of the classes offered by Georgetown required a video conference with the professor, court documents say. On October 15, 2017, Littlefair emailed Singer about this requirement, writing that her son would be out of the country, and they “should have a stand in for [my son] that is highly briefed by [the person taking the class].”

In another email described in court documents, she messaged Singer asking for a “discount” because the person who took the class earned a C and “the experience was a nightmare!”—Singer did not agree to the discount.

Littlefair allegedly paid the $9,000 to a shell non-profit corporation called the Key Worldwide Foundation, set up by Singer to accept payments for his college admissions fraud business.

Prosecutors are recommending a sentence of four months in prison, one year of supervised release, and $9,500 restitution, per the U.S. Attorney. The maximum sentence for the crimes she pleaded to are up to 20 years in prison, up to three years of supervised release, and a $250,000 fine.

Littlefair’s lawyer, Ken Julian, told CNN that his client “has taken the earliest opportunity to take responsibility for her conduct.”

Georgetown, for its part, says that as it investigated other incidents of misconduct being prosecuted by the U.S. Attorney’s Office, it “learned of potential misconduct relating to one graduated student taking online courses.” The university is conducting an ongoing investigation of that case, a spokesperson says, and in the meantime, “we have implemented or are in the process of implementing a number of additional measures to safeguard the security and identify of online course participants.”