I'm Made of Steel

Tourette syndrome - A nervous system disorder involving repetitive movements or unwanted sounds.

Lenas had the condition for years. Lillian had trained her from a young age to mask any unwanted tics with small twitches of her face. Only when she's alone does she give her brain a small break. But with Kara back from the Phantom Zone her time alone is quickly lessening.

Probably based around 6x14