It's worth considering the timings here:
June 2010 - girls go to Australia on 'holiday' for 4 weeks
July 2010 - mother informs father that they will not return
February 2011 - Queensland Department of Child Safety files for return of children to Italy
June 2011 - decision given by the courts that the children should return within one month
July 2011 - mother ignores court order
August 2011 - appeal filed by mother against court order
March 2012 - appeal rejected
April 2012 - court orders children to go to Italy, either with their mother, or with their father
9 May 2012 - father arrives to bring children to Italy, pending meeting on 14 May 2012
13 May 2012 - Australian grandmother tells the mother's lawyer if the meeting on 14th May not successful, she would kill the 4 girls, and that the mother should kill herself also.
14 May 2012 - the murderous grandmother takes the children into hiding in order to prevent them leaving for Italy
21 May 2012 - "the children were recovered by the Queensland Police." "The transcript of the taped interview of that recovery by the police is in evidence before me. It is a troubling document, particularly given what was said by the great-grandmother to the police in front of the children, and later by the great-grandmother in direct response to questions by one of the children."
Subsequent to this is more legal wrangling, and finally the children have gone home (where home is clearly Italy, since the mother herself stated www.thefamilylawdirectory.com.au/article/family-flees-to-safety-of-coast.html
?I moved to Italy when I was 15 to study Italian for a year and ended up staying 15,?
and "She said it would take a long time for her girls, who are aged seven to 13 and speak no English, to adapt to the Australian way of life.")
So the children were abducted in July 2010, the order was given in June 2011 that they should return, and since then the mother and her evidently toxic family repeatedly ignored the rulings of the court (grounds in itself for imprisonment I would say).
Given the threats to kill the children made by their own grandmother who was supposed to be caring for them, the actions of the police do not seem in the least bit disproportionate.
The mother obviously loved Italy having spent half her life there, and far from her being some sort of helpless Australian flower trapped in a sinister Summerisle-type village surrounded by shrieking Catholicscultists, she evidently had the language ability and experience of life to have moved anywhere in Italy and set up a new life.