I think the DNA is the best single evidence, and when/if they can ever get a more detailed analysis done it will be fascinating!
Most of what bothered me can be boiled down to a couple of points: first, there was a lot of hyperbole and 'emotional' adverb/adjectiving going on. To me, if a writer/researcher needs to appeal to my emotions so much, I mistrust that they've done their work to convince my mind. Maybe it was because she is a popular writer, and so felt that she had to appeal to her core audience rather than someone looking for a solid scientific analysis? Not sure.
The second thing that bothered me is that a lot of her timelines and conjectures relied heavily on whether something COULD have happened, without proof. When you string a very specific set of COULDs together, there is a corresponding set of COULDN'Ts. In quite a few of the scenarios she set up, if even one COULD was inaccurate, the whole thing would fall apart.
I'm not saying she's wrong, but without more proof hers is conjecture as well. The DNA is crucial in this case, but I wonder how likely it is that they'll ever get a conclusive answer on that.