"My life and my family are now based outside of New Zealand, so my support networks have also shifted across the Tasman".
Folau has played 128 tests for New Zealand since making her debut in 2007 and was last week named in the Silver Ferns squad to play in next month's Quad Series.
NNZ Board Chair Allison Ferguson said Folau's long and dedicated career as a Silver Fern, her personal circumstances, and her loyalty to the game here led to the exemption being granted.
"She has shown an unquestionable loyalty to Netball in New Zealand including both the Silver Ferns and Mystics," Ferguson said.
"It has been a tough season for Maria this year, now that she and her family live in Australia, travelling between the two countries to continue playing the game she has dedicated much of her life to.
"Maria's experience is really important to this young Silver Ferns squad moving forward. The NNZ Board believed granting her a 12-month exemption to be eligible for the Silver Ferns despite not being contracted to a NZ ANZ Premiership team would enable Maria to continue representing her country and mentor those new Silver Fern players coming through."