I reckon that with a TV appearance coming up, AW wanted to make sure she was prepared. We already know she was an atypical Reformista as she has a shred of integrity and wasn't a rabble rousing grifter. In the course of this, she realised that Farages £5,000,000 was not only as innocent as he protests, but definitely linked to something dodgy. Certainly not something she would have been prepared to lie about in any interview.
Being Christian, and not believing that people like Nigel Farage and Robert Jenrick are real she voiced her concerns in the naive belief it would prompt Nigel to "do the decent thing".
When it became clear that as a woman of principle, she would trigger even more scrutiny of Farage, Something had to done.