Alice Pung 
Our Australian Girl: Marly walks on the Moon (Book 4) [EPUB ebook] 
Marly walks on the Moon (Book 4)

It’s 1983… and baby mania has struck Marly’s house with the arrival of her baby brother. But Marly never realised that a new baby would take up so much of everyone’s time! No one’s helping her with her costume for the school concert. Marly’s secret plan is to perform the Moonwalk, the dance she’s been practising all year. But will she be ready? Follow Marly on her adventure in the final book of four stories about a daring girl torn between two worlds.