I find anybody who is prepared to put in some effort and collate facts, figures and opinions and try to present them in a manner that informs others deserves some credit.
I have not read the lady's book, but I would always anticipate myself disagreeing with some opinion or other, or reaching a different conclusion even whilst given the same evidence. However her efforts are still considerably greater than mine, and most likely greater than the majority here.
She may well 'feel' that JB is guilty. We all 'feel' one way or the other, unless we are truly sat on the fence.
'Feeling' need not be an irrational emotive reaction though. It can be a feeling born out of our interpretation of the evidence we are aware of.
There is always the option of countering her book with an alternative interpretation right?
Is it so wrong of her to commit her thoughts and interpretations to print? Most of us have no qualms about expressing our opinions, why shouldn't she, in whatever form she chooses?