The enumeration date is as you surmised the actual date the info was recorded. The official enumeration date was 1 June 1850, all questions were to refer to that date. So she probably died sometime between 1 June and Sept 11. Don.
Definition of plague. 1  an annoyance; those children are a damn plague. 2  any large scale calamity (especially when thought to be sent by God) 3  a swarm of insects that attack plants; a plague of grasshoppers. 4  any epidemic disease with a high death rate.
plague is a disease caused by the bacterium yersinia pestis yer sin e uh pes tis it has been in existence for at least 2000 years and in the twenty first century is still found in africa asia south america and north america there are three types of plaguen septicemic plague the bacteria multiply in the blood causing symptoms such as fever chills weakness abdominal pain nausea naw zee uh and vomiting as the infection progresses the blood pressure drops and the blood is unable to clot normally