As Mrs. Draper indicated in her unconnected posting on this site, Rena is buried in the Vasey United Church cemetery in Tay township, Simcoe County, Ontario - but not under her legal married name, but rather the surname of her deceased first husband!!
Arena Thompson died June 13, 1893, aged 86 years
is memorialized on a tombstone with a Charles Haselton (d. 1879) and his wife Phoebe (died 2 months to the day after Arena, who might be her mother???)
Hope this adds to the total picture!
Cheers! J. Brian Gilchrist, firstname.lastname@example.org