gertrude weaver became the world 's oldest person last week following the death of a 117-year-old woman in japan .
waver died from complications due to pneumonia in camden .
she attributed her long life to treating others well and eating her own cooking .
weaver was born in arkansas in 1898 and worked as a domestic helper .
115-year-old jeralean talley , of detroit , is now the world 's oldest person .