Assessing quality of writing is already extremely subjective. And even if so, I have met so many people that write for blogs/news sites/local papers that can clearly put together a thoughtful piece. However, when you try and speak to them about something and they can't edit their thoughts for hours before presenting their opinions and arguments, it comes out a whirlwind of incoherent babble. The jury is still very much out on this woman's intelligence.I think that's a bit too broad. She is clearly a very good writer.
Some people were just taught/conditioned deal with problems poorly.