I would have to agree with the person who said Sunbury, its a big town, still not connected to the city, though there is a 2 lane Hwy to the city, another good road via the airport and a train station. Its family friendly, has lots of shopping, pool, local show, etc. Its about 45-50 mins to Southern Cross and about the same by road.
I would also strongly recommend Gisborne, its about 10 mins past Sunbury, has everything, is on the same hwy, there is a train station in new gisborne and regular busses. Mt Macedon is up the rd which is a beautiful place to while away many an afternoon, beautiful hill station gardens which are regularly open that your DD would love. And it has THE BEST EVER FAIRY SHOP!!! Its called Myths and Legends... they have a website...
I would never live in Melton, its a hole. Nor would I live between Sunbury and say Essendon.... Dont really know the east side much except around the closer more expensive burbs, which would be awesome but VERY EXXY.
Hope you find somewhere.