"I can give you a list of a hundred different factors. It is complex,'' she said.
Ms Bennett has said she was confident that the plans set out by the paper - including a Vulnerable Kids Database of up to 30,000 children considered to be most at risk of maltreatment - would work, and results would be seen almost immediately.
The Government had put aside $20 million initially to set up the database and fund the 'risk predictor' model that would identify the children who needed to go on it, as well as set up the first two Children Teams; teams of health and social professionals who would work with vulnerable children in each region.
The full effects of the paper would not be seen for another 10 to 15 years when at-risk children become young adults and were having their own families.
"I think it will be in year's time, when I see those children that are thriving and are having a successful life as adults, that we'll really know. This is not a quick answer. You know, there is no quick solution. It shouldn't be in my parliamentary term.''