I would avoid it, that is not resources on mental health. That is not a scientific approach, just somebody that writes books but clearly didn't do the necessary work to validate their hypothesis
She did all the work on the business side, nothing on the science side
Not suited to be a resource for school at all
She presents herself like somebody that has made research and found a solution, a new way of doing things
But there no studies, she didn't publish anything else than books, which seems to be self help book than anything close to anything scientific
As you said she has studied, so she knows what the right way to do things in science and she choose not to
She did not do the work, and we are talking resources for school
Holistic in school, I don't agree to disagree, it is wrong