The 7-year-old mauled by dogs in Murupara has had a 10-hour operation to begin to repair the facial wounds she received during the attack.
It was the first reconstructive operation in what is expected to be a "very, very long recovery process" into Sakurako Uehara's adulthood.
Middlemore Hospital spokeswoman Lauren Young said the Japanese girl, who remains in a serious but stable condition, will undergo her next surgery on Monday.
Sakurako was attacked by four Staffordshire bull terrier-crosses while visiting a family friend's property with her parents on March 4. Doctors say she received more than 100 bites to her face, limbs, and almost "every part of her body" in the ferocious attack.
Her parents had received support from the hospital, Ms Young said, as well as thousands of dollars raised by the public for her recovery.