She fakes her death to escape her life in San Francisco.
However, the episode reveals this was a . In reality, Sophie has "Gone Girled" her life: Watch surface 2022 s01e08 720p web h264-ggez 1
Using a key found sewn into her clothes from the night of her original accident, she unlocks a storage unit containing a duffle bag full of cash, a burner phone, and a passport under her real name, Tess Caldwell . She fakes her death to escape her life in San Francisco