No one is perhaps more excited about the Treasury’s announcement Wednesday that a woman will be featured on the $10 bill than a 10-year-old named Sofia.

The fourth grader in Massachusetts wrote a letter to President Obama last year asking why there weren’t any women on American bills. In the year since, a grassroots campaign called Women on 20s started a massive online petition to get a woman on the $20 bill instead of Andrew Jackson. In May, Women on 20s announced more than 600,000 people had voted in their poll, and that Harriet Tubman emerged as the winner. On May 12, leaders delivered petitions demanding she appear on the $20 to the White House Council on Women and Girls and to the office of U.S. Treasurer Rosie Rios.

Some have argued they’d rather see a woman featured on the $20 bill instead of Jackson, saving Alexander Hamilton’s likeness on the $10 note, but the Treasury made clear in the announcement that no decision to fully remove him had been made: “There are many options for continuing to honor Hamilton. While one option is producing two bills, we are exploring a variety of possibilities.”

Regardless, Sofia says she’s thrilled. “I’m really excited that they’re going to truly get a woman on currency,” the junior ambassador for Women on 20s tells TIME. “I don’t care that it’s not the $20, I just want a woman on currency.”

Earlier this year, Sofia and her family visited the Treasury to learn more about how money is printed. While there, she left a note for Treasury Secretary Jack Lew, asking him to consider putting a woman on paper bills:

Courtesy of Kim B., Sofia's mother

Rios personally called Sofia on Wednesday to tell her the Treasury would move to introduce a bill featuring a woman in 2020, a century after women were guaranteed the right to vote.

Sofia says she hopes that woman is Anne Hutchinson, the Puritan freedom fighter who inspired her to write Obama in the first place. She’d also be happy to see Rosa Parks on the $10 bill, since she was the person who she voted for out of the four finalists in the Women on 20s poll.

Her role in the movement has caused quite a stir in her fourth-grade classroom. “Whenever there’s a report or something about me, I always show it to all my classmates and share it, because my teachers let me,” she says. “They say it’s really cool and really awesome.”

It has also taught her the importance of speaking up. “I really think that if anyone has an idea that they think would be important or something they think needs to change, then they should do something about it,” she says. “They can do a lot of things, even if they’re kids.”

Read next: What Happened When the U.S. Decided to Put a Woman on Currency in 1978

Get our Health Newsletter. Sign up to receive the latest health and science news, plus answers to wellness questions and expert tips. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Charlotte Alter at charlotte.alter@time.com.