WI your Nan sounds much like my grandma - she is 89, survived lung cancer in the 80’s after having a section of lung removed, has had two bouts of different cancers since, went through a years worth of hospitalization for various illnesses including sepsis, coded twice but came back around, pneumonia and hospitalized a year ago, and is just recently released from the hospital for a mild stroke and is now in rehab. I’m with you on the genes!!
All the things your nan has gone through leads me to think She’ll be around for a good long while yet!