I don't know what an "unauthorized" biography means. My initial reaction is that an "authorized" biography is essentially PR and a sanitized record, which would make an "unauthorized" biography better.
Most of the biographies I have read as an adult have been historical with a weight of research and scholarship. There is no indication of that here.
This is essentially a book of gossip with no real way of determining whether or not it is accurate beyond the obvious dates and figures.
Given my skepticism as to the authenticity of the quotes and incidents, the portrait that is presented is both consistently and not sycophantic.
In short, seems to have been emotionally stunted through both unhealthy fawning and indulgence and the commercialization and sexualization of her person from a very young age.
She is a complex contradiction of dependence and independence. On the one hand desperately needing to be accepted and loved, particularly by men, in order to feel alive and whole. This led to her enduring abusive and unhealthy relationships. On the other, choosing to demand her worth financially in her profession and in her personal life flaunting social norms in pursuit of happiness.