[5][6] Cech began her career as a child model, landing gigs with Gap, Ralph Lauren, Skechers, and Gymboree.

[7] She made her acting debut in a 2015 episode of the CBS police procedural Hawaii Five-0 as a young version of Grace Park's character.

John Serba of Decider said, "Cech is my favorite, carrying the character in her sideways glances and quiet, confident swagger[.] ...

[17] Cech played a lead role of Sammy in Marvelous and the Black Hole, which premiered at the 2021 Sundance Film Festival.

IndieWire stated, "[the film is] grounded by... Cech, who effectively channels the angst of teendom into an offbeat tale... [and] does solid work in immersing us in Sammy's frustration and sadness, even if the script doesn't always give her the best lines to punch with.

"[19] In December 2021, she was announced to have been cast in a lead role alongside YaYa Gosselin in Apple TV+ series Surfside Girls.