Please provide some evidence.
She walked in and will be carried out?
Having your tonsils removed is a routine procedure. You aren’t supposed to die.
Morbidity/Mortality
Morbidity other than minor post-surgical infection is uncommon. About one in every 15,000 tonsillectomies ends in death, either from the anesthesia or bleeding five to seven days after the operation.
http://www.surgery.com/procedure/tonsillectomy/morbidity-mortality