1. She has the wrist thing Doll had
2. She was infected by the nanite acid, which was laced with it.
3. They're on the planet now, and ep. 5 will go more into detail.
TV_Face covers the majority of the first two.
And its safe to say they're most likely picking off worker drones either outside or in less-protected bunkers.
OKAY I 3 QUESTIONS ABOUT CABIN FEVER; 1. HOW DID UZI MASTER THE ABSOLUTE SOLVER SO FAST? 2. WHY DID UZI BECOME A ZOMBIE DRONE IN THE FIRST PLACE? 3. WHAT HAPPENED TO J AND TESSA?