I am not a teacher and cannot comment from a teachers point of view,however this has crossed my mind.
Resident teenager has just left high school(now at college),the school two years ago changed to academy status,and there has been a huge turnover of staff,and battle lines drawn between principal and those who follow her,and those who don't this has caused a few unpleasant vendettas of her non desciples,this has impacted hugely on staff/pupil moral,and if your poor DIL has been thrown into something similar it must be very stressful.
My DGD was a target of this cleansing,simply because she spoke her mind...she preferred the non academy..