Second round is just chit chat, so no need to prep your girl. Two girls go in together, so each girl only gets 10 min.
Mrs. Dai will talk to your girl while going through her school report card and portfolio (they have asked you to bring original report card to the interview right?)
No, The 2 grls will go in and come out together, but inside the room the girls will take turns to be interviewed by Mrs. Dai one-on-one, while one girl is being interviewed the other will be asked to read some books while waiting.