Carpenter made her debut for the Australia national team at the age of 15, the country's first international soccer player – male or female – to be born in the 21st century. She was also the youngest Australian competitor at the Rio 2016 Olympic Games, and the youngest ever female footballer to compete at the Olympics. She made her W-League debut at age 15. In May 2018, she was the youngest player to appear in an NWSL game in league history at age 18.