She discloses confidential sources, something a 'journalist' is never supposed to do. Firstly she did it in 2013 with Vicky Pryce. from Wiki:
In 2013, while at The Sunday Times, she persuaded Vicky Pryce to implicate Pryce's estranged husband, former Liberal Democrat MP and Cabinet minister Chris Huhne, in having committed the offence of perverting the course of justice, leading to the case R v Huhne, and to both Pryce and Huhne being convicted and imprisoned.
Then, more recently she leaked all of Matt Hancock's private What's App messages. You could argue as some do that it was in the public interest, I can see that. But for me the only reason she does these things is for money and notoriety, not for some public good. She's a nasty piece of work with no ethics. In my opinion. Plus she's got a monotone droney voice and a face like a slapped-arse ... an even bigger crime.