The larvae of many Australian species feed on Asteraceae, see the foot of http://lepidoptera.butterflyhouse.com.au/plants/aste/asteraceae.html and many pupate in a cocoon between rolled joined leaves.
Thanks. We do know a lot of things it isn't. That rules out Psychidae. The small size rules out the Macro-Lepidoptera such as most Erebidae and Noctuidae, Notodontidae, Lasiocampidae, Sphingidae, most Geometridae. Being on Asteraceae rules out Oecophoridae.