She starred as Maddie Conrad in the musical soap opera Nashville (2012–2018), and wrote and performed a number of songs for the soundtrack.

[1] In 2018, Stella featured on the track "Polaroid" with Jonas Blue and Liam Payne.

[9] It reached number 80 on the US Billboard 200 and appeared on numerous other charts, while the single "Kissing Other People" was certified gold by the Recording Industry Association of America (RIAA).

In 2021, Stella reunited with her younger sister for the song "While You Sleep" from the soundtrack of the HBO Max film The Fallout.

In January 2022, she performed a cover of "Hey, Beautiful" by The Solids as the theme song for the spin-off How I Met Your Father.