Translate: She has not been studying (has not studied) Spanish for one year.

For an action that began in the past and continues now, Spanish commonly uses the present tense with “desde hace” plus a length of time. “Desde hace un año” means “for one year,” so “Ella no estudia español desde hace un año” is the correct translation. “Hace un año” alone means “a year ago,” while “desde un año” is not the correct way to express this duration.

AI-written and checked against the verified answer.