Tragically both she and the baby died this morning.
More details are emerging and it seems Ms Miller was a passenger in the car, and basically made the mistake of telling the 17 year old thug and his pals to stop throwing stones at peoples cars for fun. In response he threw one more that passed through the passenger side open window, striking her on the head and causing a heart attack.
She leaves a partner and an eight month old child.
Incidentally it not obvious from the pictures in the linked article, but from pictures in the Daily Mail it can be seen she is a POC

They must be learning from those supposedly being their role models.
Now who could that be be? Of course those white bastards who invaded & said the indigenous people were not human. That their 40,000 yo culture is merely there to make foundation material for American companies in the Burrup & elsewhere, their land to be despoiled by cattle, GMO crops & other practices, their menfolk to be incarcerated, that's if they survive the hundreds of kilometres without water in the back of a police paddy wagon in 60°C temperature being taken to be judged.
They may not have thrown the chunk of concrete but the white kids their age are similarly influenced, indoctrinated & educated in the same state by the same role models, prejudices & attitudes.