YOU SAID:

where have i seen her before

INTO JAPANESE

どこで彼女に会ったことがありますか

BACK INTO ENGLISH

Where have you met her

INTO JAPANESE

どこで彼女に会ったの？

BACK INTO ENGLISH

Where have you seen her?

INTO JAPANESE

どこで彼女に会ったの?

BACK INTO ENGLISH

Where have you seen her?