That is one of the first books I ever bought but the one I found to be of the least value. She is too much into self-promotion and does not really address concussion issues. Her issues were an aneurism with little overlap with mTBI and PCS in my view. She holds a doctorate in education but claims to be a neuropsychologist which is traditionally a PhD in psychology or a PsychD.
Her CV is here. http://www.drdiane.com/about-dr-diane/curriculum-vitae/

There are many other books on Amazon that look better.