A Te Whatu Ora - Health New Zealand Hawke's Bay spokeswoman said the woman was in a serious condition this morning.
Meanwhile, a woman in her 30s who was seriously injured and flown to Hawke's Bay Hospital when a tree reportedly fell on her vehicle is now in a stable condition on a ward, according to the spokeswoman.
Emergency services were called about 5.30am to State Highway 2 through Mohaka, in the Wairoa district, yesterday morning.
Wairoa mayor Craig Little said earlier that he saw a vehicle "well below the road" that appeared to be on its side.