@evan I agree that she's not portrayed as the 'perfect' person: if we are not supposed to view her as a 'perfect' victim of some unfounded accusations, then why hide so much more about her? It seem to me that they are showing an honest Sandra, with good and bads.
It is strange that she wrote the book, but not unheard of in terms of what people write books about. Also she might have hit him as well, but that's enough to make her a killer?