In 2019, she won the fifth series of Love Island. She has since presented the ITV series The Full Treatment (2021), as well as competing on the Channel 4 survival series Celebrity SAS: Who Dares Wins (2022). Also in 2022, Gill released her debut romance novel, Until I Met You.
Prior to her television career, Amber Gill worked as a beauty therapist at a salon which she ran alongside her aunt.
In June 2019, Gill became a contestant on the fifth series of Love Island. She entered the villa on Day 1 and throughout the series, coupled up with Callum Macleod, Anton Danyluk, Michael Griffiths and Ovie Soko. However, it was with rugby union player Greg O'Shea, who entered on Day 44, that she went on to win the series with on 29 July, beating the bookies' favourites Tommy Fury and Molly-Mae Hague in the final.
Since her appearance on Love Island, she has gone on to make guest appearances on various different television series including Love Island: Aftersun, This Morning, Good Morning Britain, Loose Women, Strictly Come Dancing: It Takes Two, Lorraine and Ant & Dec's Saturday Night Takeaway. She has also released a clothing line with Misspap.
In June 2021, it was announced that Gill would present The Full Treatment on ITV2 alongside fellow Love Island winner Kem Cetinay. The series partnered with the mental health charity Campaign Against Living Miserably and featured Gill and Cetinay giving celebrities makeovers whilst discussing their mental health and wellbeing. Gill was asked to judge a writing competition held by Mills & Boon that was searching for stories from underrepresented ethnic backgrounds.