Tropical Cyclone Wasi is slow moving east southeast at 12km/hr with winds close to the centre at 83kph.
The death toll has risen to 71, with the majority being children and babies.
"We lost our little girl. So please parents, be aware of your kids."
Their message comes as Samoa's death toll hit 60.
The PM says she will personally follow up on the incident with the Health Minister.
A document states that vaccination units are being mobilised for the MMR vaccination plan.
Her little girl was buried in the same grave as her one-year-old nephew.
"May God's healing be upon us all."
"People are dying because of these cultural ways."