In her first three seasons with the Sky, Copper generally came off the bench and averaged 6.7 to 7.1 points per game. In 2020, she was re-signed by the Sky. She was elevated to a starting role in the 2020 season, which was played in a "bubble" due to the COVID-19 pandemic, and led the team in scoring with 14.8 points per game. She continued into her starting role in the 2021 season, and was named as an All-Star for the first time. Copper led the Sky to their first championship in 2021 and was named 2021 WNBA Finals MVP.
