Ella's cita/compromiso/entrevista/reunión es a las ocho.
To complete the sentence, we need to fill in the blank. The phrase "a las ocho" in Spanish means "at eight o'clock." So, based on the context, we can assume that Ella is doing something at eight o'clock. However, without further information, it is impossible to determine the exact word that fills in the blank. We would need more context or clues to provide a specific answer.
