Yes, I seem to agree with you. No our 'girl'.
I have now vaguely established from my 90 year old mother that my Grandmother Ellen Elisabeth Curtis) came to SA with her 2 brothers, one named John.
Whew, so difficult without a reliable source of information on my side.
The marriage certificate is authentic as my mother instantly recognised her handwriting and signature etc.
If only we could obtain a birth certificate but this remains is the big mystery........