She began her career as a child actress in the BBC film Sherlock Holmes and the Baker Street Irregulars (2007).
[2] Hewkin attended Hills Road Sixth Form College and trained in Martial Arts and Piano, where she achieved Grade 8.
Also in 2015, Hewkin made her professional stage debut with roles in The Vote at Donmar Warehouse, Hidden at the Royal Court Theatre, and Clickbait at Theatre503.
Hewkin starred in the titular role of the 2016 stage adaptation of Studio Ghibli's Kiki's Delivery Service at Southwark Playhouse.
In 2022 it was announced that Hewkin had been cast in the Netflix series The Brothers Sun produced by Brad Falchuk, playing twins May/June alongside Michelle Yeoh.