Blackout

My 84yr old grandmother lives independently in her own home. After her first shot she felt unwell for a few days, yesterday she received her second shot. Later that evening she drove home and blacked out right by her vehicle. She has no memory of what happened. Thankfully the garage door was still up and when she eventually woke up (1-1.5hrs later) she was able to flag down someone passing by for assistance. She was taken by ambulance to hospital, X-Ray & CT scan completed. Doctor said she is having heart fibrillation, top heart chamber was beating quite fast. No records of her having that before. She has since been discharged back home. Same day as her shot, consequence maybe but what are the chances. Poor thing has a broken nose, laceration across her nose and two black eyes developing. 

Is This NZ Based or Overseas? : NZ