Lightning Dust pled out, was briefly placed in Juvie, but was quickly released for her exemplary behavior, and on recommendations from her parents' friends. It paid to have connections apparently.
Once Dust was released, she returned to school, doing everything she could to appear as a model student. Hearing that Dust was out, Gilda got messages to her through friends. They were not allowed to meet, but that didn’t stop them from communicating and planning. Together they planned their revenge on Sunset.
It looked like Dust would need to make a new ‘friend’ to make this work.