After tagging along to an open audition with friends, In 2012, Cobham-Hervey played the supporting role in Projector Films' feature
One Eyed Girl. In 2013 she created and performed the front-of-house entertainment at the
Adelaide Festival club, Barrio, for the re-launch of the
Myer brand, filmed in New Zealand over three days. In 2016, Cobham-Hervey appeared in her first play as Rosie Price in
Things I Know To be True, which was written by
Andrew Bovell for a co-production between
State Theatre Company of South Australia and UK's
Frantic Assembly. She played the role of Kitty in the six-part TV series
Fucking Adelaide, directed by
Sophie Hyde, which premiered at the
Adelaide Film Festival in October 2017 and screened on
ABC national television as well as
iview from 2018. Cobham-Hervey's directorial debut, a
short film commissioned by the ABC and
Screen Australia as part of the
ABC ME Girls Initiative, premiered simultaneously at the 2017 Adelaide Film Festival and on ABC ME on 11 October 2017, the
UN's International Day of the Girl. Made by Sophie Hyde's
Closer Productions in Adelaide,
A Field Guide to Being a 12-Year-Old Girl was awarded the
Crystal Bear for Best Short Film by the Youth Jury of the
68th Berlin International Film Festival's Generation KPlus Section in February 2018. In 2019 Cobham-Hervey played the role of Nanny Sally in the major film
Hotel Mumbai. In December 2017, she was cast in the lead role as Australian singer
Helen Reddy in Australian film-maker
Unjoo Moon's bio-pic
I Am Woman. Filmed in Australia,
Los Angeles, and
New York City in late 2018, the film premiered at the
Toronto Film Festival in 2019. Her performance was lauded by
The Hollywood Reporter, describing it as a "breakout performance". Cobham-Hervey and
Dev Patel co-wrote and co-directed a short film,
Roborovski, about a
hamster, which premiered at
Flickerfest in
Sydney in January 2020. The film won three prizes at the
Rencontres Internationales du Cinéma des Antipodes (Antipodean Film Festival) at
Saint Tropez, France, in 2021: Australian Short Film Today; the
Nicholas Baudin Prize; and the Audience Award. In 2021, Cobham-Hervey devised an interactive theatre piece entitled
Two Strangers Walk into a Bar which was premiered in the
Adelaide Fringe and had a later season at
MOD., a South Australian "futuristic museum of discovery". By December 2021 she had relocated back to Australia, after around four years in
Los Angeles, to film
The Lost Flowers of Alice Hart. In September 2023, she took the main role as Esme Nicoll in the stage adaptation of
Pip Williams' novel
The Dictionary of Lost Words, co-produced by the State Theatre Company South Australia and
Sydney Theatre Company. The play, written by playwright
Verity Laughton, premiered at the
Dunstan Playhouse in Adelaide, before moving to the
Sydney Opera House. In late 2024 she was cast in the
Netflix series
Apple Cider Vinegar. In 2025 Cobham-Hervey wrote and directed the film ''It's All Going Very Well No Problems At All'', in which she also stars, in Adelaide. The film was completed by April 2026, and is due to be released as part of the Adelaide Film Festival. ==Personal life==