Considering I only see her during the lessons as she "hides" in her office by the preparatory school, it would be quite hard to get her alone to hypnotise her, and the only chance would be during a lesson, by either:
1) The Handshake Induction when she walks throught the classroom door (but why would a student want to shake your hand?)
Or 2) Walk up to her desk in the lesson and do it.
However, whilst that is possible I would still have the dilemma of her remembering she was hypnotised and then telling another teacher, etc and me getting expelled. (Maybe that's a little too far, but still.

)
Hypnotising other kids when teachers aren't looking is one thing, but trying it out on a teacher who
seemingly finds the whole proccess scary, is an entirely different thing
I mean, even if I was to march up to her and do some instant induction from cold, I'd have to guarrentee that she wouldn't remember a
THING.
I'm afraid I'll have to ask for any routine ideas that incorporate some form of amnesia, so I'll try it on other kids 1st, and then consider zapping Mrs. Robson
Thank you Anthony! (and others)
Fabian.