[3] Ramsey was approached while working in a restaurant on Sunset Boulevard and received an audition the next day,[4] for a role she won—The Real Cancun, a documentary that revolves around the exploits of several American youths in Mexico.

[5] She then began a role in ABC's television series, The Days[6] before making her feature-film acting debut with Catherine Hardwicke's Lords of Dogtown.

[7] She returned to television and made an appearance in an episode ("The Jet Set") of the AMC series Mad Men.

[9] In 2023, after taking an eight-year hiatus from acting, Ramsey starred in Lifetime's television film A Rose for Her Grave: The Randy Roth Story that is loosely based on the book of the same name.

[13] In 2022, Ramsey launched her own organic herbal company called Nia's Arc, after completing an apprenticeship in plant medicine.