Think you are trying to link to the wrong family. Edwin Davenport and Sarah Rawlings married in Lambeth, London, all their children baptised in Lambeth and they lived in Lambeth on the census. They certainly do not appear to have had a daughter with this name and their son, as has been pointed out already, was named Edwin Albert Davenport b.1874 (reg'd as Albert Edwin but baptised and known as Edwin Albert) and he remained in the UK where he died in 1952.
So, if we take a step forward, where/when did 'your' Edwin die in Australia? Where in England did 'your' Edwin and sister Elizabeth Jane come from? They certainly were not children of Edwin Davenport and Sarah Rawlings.
The birth mentioned by Cando can't be the one as that child died in the same quarter of birth.
Annette