[2] Cline was born on December 21, 1997, to estate agent Pam and engineer Mark and was raised in Goose Creek, South Carolina, near Charleston.

[3][4] She briefly was enrolled in college at Coastal Carolina University, but dropped out and moved to Los Angeles to further pursue acting.

[7] Cline spent some of her early summers in New York City working on television commercials and print ads for T-Mobile, Flow Automotive, Next clothing[8] and Sunny D.[9][10] She later got minor roles such as Chloe in Boy Erased (2018) and Taylor Watts in Vice Principals (2016–2017)[11] She also had small recurring roles in The Originals (2017) and Stranger Things (2017).

[12] In 2020, Cline began starring as Sarah Cameron in the Netflix teen adventure drama Outer Banks.

[7][16][17][18][better source needed] In 2023, she became a brand ambassador for Tommy Hilfiger and appeared in the "Summer Essentials" lifestyle campaign with Mason Gooding.