Of Scottish and Polish descent, Isabella Swietlicki began her ballet training at the age of eight in Scotland. At thirteen she toured China for six weeks in the role of Clara in The Nutcracker, and the following year performed in another China tour of Romeo and Juliet. At fifteen she won the Molly Lake Award in the UK, and at seventeen won the bronze medal in the Genee International Ballet Competition in Antwerp, Belgium.
From 2013 to 2016 she trained at the English National Ballet School. During her time there, she performed the Tchaikovsky Pas de Deux by Balanchine in the La Fenice Theatre, Venice, at the Gala Internazionale di Danza, 2015. In her final year, she was selected to dance with English National Ballet in their production of The Nutcracker, and in her graduating show, performed in Act 3 of Raymonda as a soloist. She also performed in Arctic, a contemporary piece by Jose Agudo.
After graduating, Isabella joined the New English Ballet Theatre, which forms each year to showcase new choreography. Isabella performed in works by George Williamson, Daniela Cardim, Marcelino Sambe and Kristen McNally. She then joined English National Ballet as a seasonal artist until January 2017.
She joined the Royal New Zealand Ballet in January 2017.