Can't find Jane's death either.
The only death I can see for a Jane Grigor other name Ross is in 1926 George Square Edinburgh
Age 45 years ...Had a few credits and it is her she died Royal Infirmary 30 thNovember 1926
Her usual residence was Crieff ...Father John Grigor deceased ...Salmon Fisher
Mother Margaret Grigor maiden name Davidson ...Death was registered by her husband John Ross
If you Pm me I will send you the copy ....Still does not help with the mothers name on marriage certificate ....which could possibly been a mistake ?
Rosie