Mrs C.E. Prell, born Caroline Ivy Chave, was the wife of Gundowringa grazier Charles Ernest Prell and president of the Goulburn CWA. Prell, son of a German-born but Melbourne-based merchant and property investor who moved into huge country holdings, was a famous investor and ideas man for improving pastures and stock in dry country. There was a Prell Scheme for introducing young English migrants to the land. The Prells were friends of Olive's father, the Fitzhardinges and their daughter Prudence. The Prell's daughter Peggy was a bridesmaid at Prudence's wedding and her parents were guests.
CE Prell became a lifelong favourite of Canberra committees enquiring into conditions on the land.
For more, see the Australian Dictionary of Biography, entry for Prell, Charles Ernest (1865–1946).
Also Graeme Davison, "The Rise and Fall of Marvellous Melbourne", MUP 1978, pp. 23 & 28.