reesan on Family Tree Circles

Dinah Giddins (born in Kurrajong, NSW), the 4th child of William Giddins and Harriett Barwick had 3 children. The 3rd child, Oliver Giddins (born in Kurrajong, NSW), is my great-grandfather.

Oliver's 1913 Marriage Certificate indicates that his mother is deceased. However, I have the following for Dinah Giddins:

- Noted on the 1903 Electoral Roll in Queensland
- Queensland BDM's online index indicates a marriage to Denis Brennan in 1903
- Listing on further Queensland Electoral Rolls up until 1925 in the name of Dinah Brennan

Given this contradiction, I would be grateful if anyone could provide information on Dinah Giddins. In particular, whether Dinah Brennan from Queensland was the Dinah Giddins from Kurrajong, NSW.