Also, OK Vital Records has a new online index: ok2explore.health.ok. gov
There is a Sarah J Nolan listed with a death date of 19 June 1926 in Creek County .(Sapulpa, where she lived, is in Creek County.)
Since this death record is over 50 years old, it is an open record and you don't have to prove a family connection. There is an online application form / directions / $15 bucks.