Born and raised in Toronto,[1] Mandel was drawn to singing and performing from a young age and began playing guitar in her freshman year of high school.

[1] In June of that year, she released the single "Dead Inside", and the following month she filmed an exclusive bedroom performance of the song for Ones to Watch.

[6] In September, she joined Simple Plan and New Found Glory on their joint Pop Punk's Still Not Dead tour.

[12] In February 2022, Mandel collaborated with Maggie Lindemann on the single "debbie downer"; the song and music video reference the 2000 film Bring It On.

[15][16][17][18] Two more singles were released over the next few months: "junkie", whose video pays homage to the crime drama Breaking Bad,[19] and "THE FLOOR IS LAVA!!".

[23] March 2023 saw the release of a new single, "5, 6, 7, 8", a collaboration with Travis Mills' band Girlfriends, with production by John Feldmann, The Futuristics, and Brock.

[3] Her sound has been compared to Green Day, Avril Lavigne, Paramore, Renforshort, Charlotte Sands, Upsahl, Wens, Liz Lokre, and BRDGS.

[1][8][16] Mandel herself has cited Green Day, Avril Lavigne, Simple Plan, Weezer, Hilary Duff, Taylor Swift, Julia Michaels, Alanis Morissette, Boygenius, and Broadway musicals as inspirations.

[1][4][6][49][50][51][29] In regards to her genre, Mandel has said, "I feel like I have a couple of different sides to me — one being upbeat, like pop rock, and another one being more singer-songwriter-y, and I try to get both of those elements in my songs.