The 21-year-old worked on slope safety at the Wanaka skifield during the 2023 winter ski season, and was well-liked by her colleagues.
Cardrona and Treble Cone experiences general manager Laura Hedley said it was a difficult time for staff.
"Our team is heartbroken at the news of Isabella’s passing, and we’re sending our thoughts to her whānau and the wider snowsports community at this time."
Miss Bolton was back-country skiing with a group of five others on Mt Yotei, in Hokkaido, when the avalanche struck at an elevation of 650m to 700m on the northern side of the 1898m mountain.
She was one of two New Zealanders who died in the avalanche. A third New Zealander was injured.
The identity of the other two New Zealanders is not yet known.
A Bolton family member said Isabella was born in Watford, England, and grew up in Diamond Harbour and Heathcote Valley, in New Zealand.
The former Rangi Ruru Girls’ High School pupil was described as being "full of vitality" and having a "passion for life".
"It is with a heavy heart that we confirm the passing of our beloved Isabella Bolton," the family spokesperson said.
"Her adventurous spirit and love for skiing and the outdoors led her to study for a diploma in outdoor adventure guiding in Banff, Canada."
Since then, Miss Bolton had worked on skifields in Canada, Tekapo and Wanaka, and in November last year she travelled to Japan to pursue a job in Niseko, near the mountain where she had thrived as a ski guide.
The family extended their "deepest sympathy" to the family and friends of her fellow colleague and friend who also died in the avalanche.
Miss Bolton’s body is being brought back to New Zealand.
A Ministry of Foreign Affairs and Trade spokesperson said the New Zealand embassy had offered consular support to the families of those involved. — Additional reporting The New Zealand Herald
