Her method is based round her own ideas, the Alexander Technique and Russian Release method of piano pedagogy. I know a bit about Alexander Technique as my first guitar teacher ended up training as one so I was exposed to it and still use the little I have learnt today for myself and in my teaching.
During my training as a guitarist with my second and main teacher Stephan Bulmer, I was taught much of what she speaks about in reference to the use of the whole body in relation to the instrument and tension free structures. So I have been able to apply a little of what she talks about and I think it has already made some difference. Well worth a look!