彼(かの)女(じょ) kanojoは waせいぜい seizei二(に)流(りゅう) niryuuの no歌(か)手(しゅ) kashuだ da。 She's a second-rate singer at best. musicmusiciansevaluation and judgment~流 (rank/tier suffix)せいぜい (at most/at best)