The leaves are possibly OK for Atriplex semibaccata, though I would like to see some measurements. Wait till it fruits. Semibaccata can have fleshy fruit, but in NSW they are usually dry.
Vicflora says 40 cm high or prostrate. i have seen it about 2 m across. Here is a link with photos. https://vicflora.rbg.vic.gov.au/flora/taxon/b0c88d5d-ba8f-40b8-b5a4-e3a610171742
Michael, are you sure about the ID? The shape of the fruit looks a bit wrong to me, also the fruit seems to sit on a whirl of red sepals (?). I'll go and take another photo if I'm there next.
This looks a lot like Einadia nutans to me. It doesn't usually get to be chest high, but it does lean against taller plants and achieve at least a couple of feet above the ground pretty regularly, so it is not out of the question that it would get to that height.
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