Just wanted to share a thought that came in my mind that may be it is kokila's plan to catch rashi red handed. May be she will ask the teacher about rashi's acts and disclose it in front of family.
That's why she might have sent rashi to write for her even when she knows what rashi has done with gopi in the past.
The teacher was completely not understandable just sitting there and doing nothing. Couldn't he find any child to write for gopi in rashi's absence.
I just hope for something positive.