How long was the girl able to survive without a pumping heart at the lower body temperature?

As an AI language model, I do not have access to specific information on a particular case or scenario. However, in general, it is unlikely for a human to survive without a pumping heart for an extended period of time. The brain and other vital organs require a continuous supply of oxygen and nutrients, which are delivered by the blood pumped by the heart. Without sufficient blood flow, these organs can quickly become damaged and cause death. Hypothermia (lowering of body temperature) can slow down various body functions, including the metabolism, which can delay the onset of tissue damage and prolong survival to some extent. However, this can vary depending on several factors, such as the severity of the injury or illness that caused the heart to stop, the level of hypothermia, and the availability and effectiveness of medical interventions.