Senior Veterinarian Baukje Lenting said Gari had several surgeries when she arrived in Wellington.
"We don't know how Gari sustained her injuries but due to the severity of the wound around her lower abdomen, her vent has changed shape and location since healing. This means she would likely struggle to produce and lay fertile eggs in the wild."
Lenting said Gari's situation was rare and had a high fatality rate because she may be unable to pass a fully formed egg.
Wellington Zoo Animal Science manager Simon Eyre said he still wanted to give Gari another chance at a good life.
Taronga Zoo in Australia is the only place in the world where Fiordland Crested Penguins are looked after permanently in human care.
Eyre said when the decision was made to send Gari there he knew she would be in good hands.
"They have a lot of knowledge about looking after this species of penguin, and the zoo currently has two other rescued Tawaki at their facility to keep Gari company."
A blessing and farewell ceremony will be held for Gari at Wellington Zoo later this month.
At the farewell Wellington Zoo will be sign a Memorandum of Understanding with the West Coast Penguin Trust.