It's reported here (and in a number of other places) without any reference to the Daily Mail or any other source for that matter.
http://www.newstalkzb.co.nz/news/wor...quiry-resigns/
If she didn't say it I'd imagine she'd be pretty upset about these claims and possibly considering legal action.
I wouldn't be surprised that, given all the time off it's reported she took*, she was asked to resign. Whatever the truth, it's all starting to remind me of the FA's legendary mishandling of the national team's managerial issues...
*
https://twitter.com/timesoneill