On NAIIRS she is listed as maiden name LADD, but it could be an error. On the gravestone it looks more like CADD.
DEPOT KAB
SOURCE MOOC
TYPE LEER
VOLUME_NO 6/9/615
SYSTEM 01
REFERENCE 820
PART 1
DESCRIPTION MCLACHLAN, ELIZABETH. NEE LADD. DEATH NOTICE.
STARTING 19090000
ENDING 19090000