Billie got her early start in music thanks to parents who surrounded her with the music of Nick Drake, John Martyn, Joni Mitchell, Joan Armatrading, Kate Bush, Loudon Wainwright III and northern folk artist Chris Wood. The family lived in the cathedral city Ripon, North Yorkshire, where Billie grew up in and around the Dales. Billie was then signed to Chess Club Records, an imprint of Sony. Not long afterwards, she was nominated for the BBC Sound of 2016.

Her critically acclaimed debut album, Writing of Blues and Yellows, was a diarist, open-hearted collection of quietly beautiful songs released in 2016, when she was still just 17. The following year, she moved to London, where she worked on her 2019 follow-up, Feeding Seahorses By Hand, which The Line of Best Fit declared a "gentle and reserved masterpiece". Towards the end of 2019, Billie underwent a total overhaul, leaving Sony and choosing a new management team. She signed to Fiction records, a division of Universal, in lockdown via zoom. She then went back into the studio and reunited with producer Rich Cooper. Billie felt empowered to experiment and rediscover herself.

Since then, she has toured frequently throughout the UK and US, and has released her acclaimed fourth record Drop Cherries. Her writing themes explore social commentary, the struggle with modernity vs tradition, nature, mental health, relationships, and a general voyeurism on the world as she sees it.