What Causes Cardiac Arrest Immediately After C- Section?

my friend recently had a c-section. Immeiately after birth she went into cardiac arrest and had no pulse. She was intubated by the anesthesiologist and a code was called. A defibrilator was brought in and she was shocked. After 3 shocks heart beat was reestablished. The birth was recorded at 11:44 a.m. and the first shock was at 12:07 p.m. She has been on life support ever since. Should the OR have been equipped with a defibrillator or an AED? Should the OB/GYN and the anes made sure an AED was in the OR and they were properly trained in its use?