Blue and red decorations have already sprung up in most parts of the country's capital, Apia. National flags hang from rooftops, lamp-posts and trees and adorn flowerbeds and gardens in many villages.
Mrs Sione, born two days after the first official celebrations in June 1962, says she has always understood the significance of her name, but admits she tried to change it once because she felt the name was "too big" for her.
Speaking to the Herald at her home in Safune, Savaii, she smiles shyly as her children gather around to listen to her explanation.
"I never liked my name. When people asked for my name, I would say my middle name [Mareta]. I told my family one day I was going to town to have my name changed and everybody said, 'Don't! Do you know how important your name is?'
"My parents never really explained why they called me Malotuto'atasi - it's something I've always known.
"I think my mother just wanted to call her baby that, so I would always remember I was born at an important time of our country's history."
Mrs Sione is among a group of women from her village who will travel to Apia, in Upolu, this week to take part in a march. A flag-raising ceremony will be held in the capital.
Celebrations begin this week and will include a variety of events such as parades, cultural performances from village groups from around the country, arts and crafts shows, exhibitions, sports events and a special Independence Day concert put on by reggae royalty: band UB40.
Mrs Sione, who has family in Mangere in South Auckland, said there were no plans for a big 50th birthday party at this stage. She expected to get emotional during the march.
"My parents have both passed away now," she said.
"It would have been something else were they still alive to see where our country has come. I'll be thinking of them on that day."
