The hospital would not say which of the women was critical.
The hospital is continuing to give specialized burn care to the two other patients transferred there. "One is in a critical condition".
There were 47 people, mostly tourists, on or near the White Island volcano when it erupted on December 9.
The toll includes two people whose bodies have not been recovered.
Tourists including Australians from a cruise ship travelling around New Zealand were on the active volcano on a guided day trip when it erupted. New Zealand scaled down the search operations and has acknowledged that the bodies of the two missing people may never be found.
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A number of funerals have been held for the Australian victims, including for Winona and her parents Anthony and Kristine.
Three members of a Sydney family killed in the White Island volcano tragedy in New Zealand have been farewelled at an emotional memorial service on Monday.
Dallow's husband Gavin Dallow, 53, and daughter Zoe Hosking, 25, were killed on the island.
New Zealand authorities are investigating the circumstances around the disaster.
The 18th victim has not yet been formally named.