Not necessarily correct but National Probate Calendar has Mary Frankish Parker, of 4 High Croft Dobbin Hill, Sheffield, died 24 November 1986.
"Mary Frankish" GRO death & GRO 1912 birth (mother Frankish).
Thanks Terry, her burial is on this site but they put her name wrong on the burial register, might have to see if I can get over to Crookes to see if there is a headstone.
Looks like from the info on this site she was cremated at Hutcliffe Wood but her ashes interred with her parents.