Now in a wheelchair after Pfizer shot

My mother in law was vaccinated along with 120 other residents in a rest home last week. She is 74 yrs old, fit as a fiddle, still driving and gets out often. She is only in the home because she has not the best life skills and became very fearful during the level 4 lockdown. 2 days on from getting the vax she was unable to walk and had a searing headache. She is now having to use a wheelchair, have help with toileting and showering. She is also unable to think clearly and is having problems with expression. My partner is heartbroken.

Is This NZ Based or Overseas? : NZ