A top aide to Scott Pruitt, Millan Hupp, resigned from the Environmental Protection Agency, according to a source briefed on the matter and correspondence reviewed by The Atlantic. Her last day will be Friday.

Hupp, who worked as the director of scheduling and advance, has been entangled in many of the scandals dogging EPA Administrator Pruitt. In March, she was one of two aides who received hefty salary bumps, even after the White House refused Pruitt’s request for raises. And as The Washington Post reported on Monday, she recently testified to the House Oversight Committee that she regularly spent her days doing personal tasks for Pruitt, from hunting for housing to calling the Trump Hotel in Washington, D.C., in order to inquire about purchasing a used mattress.

According to one top EPA official, the 26-year-old was “tired of being thrown under the bus by Pruitt,” and weary of seeing her name constantly appear in headlines about the agency. Officials began drafting her resignation paperwork on Monday morning, just after portions of her congressional testimony had been made public.

Hupp’s testimony contributed to the long list of scandals and improprieties plaguing the agency—including, most notably, that Pruitt rented a Capitol Hill condo from an energy lobbyist for just $50 a night, and spent more than $40,000 on a soundproof booth in his office on the taxpayers’ dime. The Washington Post also reported that Pruitt instructed Hupp to inquire about opportunities for his wife to purchase a Chick-fil-A franchise. For months now, according to multiple White House and EPA sources, officials as senior as Chief of Staff John Kelly have lobbied President Donald Trump to fire Pruitt.