Problem was when she got there, the other people in the office thought her dress looked like a party dress, so they thought she was dressed up to go clubbing afterwards, later in the evening, and wasn't that serious about the job.
El problema es que cuando llegó las personas de la oficina pensaron que llevaba un vestido de fiesta, así que imaginaron que iba vestida para salir de fiesta más tarde y no le interesaba el trabajo.