Carolyn Myss writes about the individual human energy system, but dosen't take energy thinking far enough--that's why many of her arguments break down. When thinking about any sort of system, one must consider the smaller energy systems which compose it, as well as the larger systems in which it is embedded. Each system "level" has its own sort of consciousness and imperatives to follow. The "level" at which our conscious egos work is only one piece of the complex puzzle of reality which composes and enfolds us.
Thus, from a systems perspective, disease can follow dysfunction on ANY level, from the cellular to the social or environmental(and maybe even the galactic). One example would be cancers caused by pesticides--here,the human collective's disrespect for the planetary environment would be wreaking consequences through the illness of individuals. There need not be a particular biographical factor in the genesis of such a cancer, for as a individuals we are all subject to consequences following our collective actions.
Similarly, disease can spring from breakdowns on the cellular level of our systems--thus, plants and animals fall prey to illness in the wild (as they also do from human-caused habitat destruction and pollution). Would Myss say that these non-human creatures were responsible for their illnesses because they did not do their soul or emotional work? Non-human biological systems succumb to disease--what does her model say about this?
To say that biography is the only (or principal) factor in illness is taking a one-dimensional view of disease and the systems it disrupts. Things are much more complicated than that.
Myss similarly oversimplifies in her comparison of the Christian sacraments, the Hindu chakra system, and the Kabbalistic Tree of Life. These ways of seeing the human spirit-path are similar only on a very superficial level--it would take years of study and personal practice of each of these traditions to understand each one, much less to undertake a "compare and contrast" exercise.
There are better books out there about the chakras--books which were written years before Myss began writing. However, for an even more in-depth understanding of energy healing I would recommend reading some of the new books out on systems thinking, especially as it pertains to biology. (Kaufman's book "At Home in the Universe," is one such book--there are many others listed on Amazon.) Also, any books which explore sub-systems within the human psyche (depth psychology) pertain to this field, as any ego-self wishing to heal will have to do business with the "others" which exist within and which have their own energies and axes to grind.