Why not just climb out the window?
She should be able to fit through it with her size
hell even MC could probably climb out himself by stacking up the gym equipment
They could probably also just open the door; that big round piece at the base of the knob is to cover the gaping hole where the latch mechanism is (you can actually see the hole when he breaks the knob off), all they'd need to do is reach in and slide the latch over with their finger, they could even push the knob out the other side so the latch falls out entirely, and short of those the central shaft is square and should provide enough leverage to open the door.