Leaving the band to pursue "fashion and other projects"

By the way, this decision may also help prevent future generations from perishing in a CO2-related inferno!

From this page:

Trevisan explains her decision to leave CSS: "I decided to move forward and dedicate more of my time to fashion and other projects. Just a big change of priorities, as I will never stop playing music."

"I am also a bit worried about climate change. People should care more and do something about it. I decided to fly less."