If some of her methods didnt always work but we were lead to believe they did... well, thats a bit of a swizz, isnt it!
I think books such as The Dog Listener only deal with fundamentals - they educate you into understanding a little how a dog may think, and/or how to adjust your own behaviour in order to change your dog's... but if the problem(s) run a little deeper, or other variables are involved (such as differences in breeds) that dont permit their suggested techniques to work, then they wont provide all the answers.
I guess thats proven by the fact that we still felt the need to seek out an informative interactive website such as this one