Sumner had plans to complete a degree at Teesside University, but decided to defer her studies after successfully auditioning for Britain's Next Top Model.
Over her stay, Sumner received three first call-outs and survived two bottom two appearances over Lisa-Ann Hillman and Annaliese Dayes.
[5] Sumner released a single entitled "Aiming For You" on iTunes and her photos for Vogue Italia are featured in the August 2012 issue.
[citation needed] Sumner, along with co-stars Allison Harvard and Dominique Reighard, was featured and walked in the 25th anniversary of Bench Universe Denim and Underwear Show in September 2012.
In October 2016, Sumner was guest judge in the coronation night of Miss Earth 2016, in the Mall of Asia Arena, Pasay, Metro Manila, Philippines.
In 2023, Sumner made her big screen acting debut in Killington, a dark comedy/horror film by Matt Vita and Mark Dudzinski, co-directed by Frank Perz.