Phoebe was born the second child of Ian Page Jr. and Heather Page. She was cared for by Noirian Nanny, Mary Semple, and with her father spending time with her on occasion and her mother rarely in her life despite living in the same house.

Phoebe attended Southbridge Prep-Prep, Southbridge Prep, and then Southbridge School where she met her best friend Isabelle Sullivan.

As a teenager, Phoebe enjoyed photography and almost always had a camera on her. She would also recorded dances she and Isabelle learnt on a camcorder. Phoebe also began struggling with her body image during her teenage years and developed an eating disorder.