Both of Withered Chica’s hands are missing, with long wires pouring out from Chica’s handless arms. Her mouth goes around almost her entire head, to a point where it looks like her entire head got bent in half. Her mouth is wide-open with both her costume teeth and endoskeleton teeth visible, as well as tons of wires going between the top of her head to her torso. Her costume is in pretty bad shape with dirt, scratches and holes all over it. her arms also seem to be stuck in the 't' position
Withered Chica's starting location is Parts/Service. When Withered Bonnie leaves the room, Withered Chica can be seen knocked over, but Bonnie probably did this when he left the room.
She then goes to Party Room 4, Party Room 2 and then enters the Right Air Vent that leads to the office. Chica is the only withered animatronic who doesn't appear in the hallway, she instead goes straight to the vents. If Withered Chica is in the office, failing to put the mask on, or failing to put it on quick enough will trigger Withered Chica's jumpscare.
To avoid Withered Chica, Bonnie and Freddy, it's best to put the mask on everytime the monitor is lowered. This way death can be avoided.