The GRO can put a note on their master copy of the death index but they cannot then let every holder of the death index know about the error as there are far too many worldwide.
Find My Past will not make any amendment either as the transcription is correct, the index is wrong, and they can't correct an entry just on your say so.
A postem on freebmd is the only way forward on this so anyone in future looking for her might stumble across your note but only of they search on 1st name and reg district, not surname.
