That’s why Jane Fae is chosen: because she’s articulate, has campaigning experience and is intimidating in her body language.
She has also evidently realised that the knitting is now seen as a gimmick and dropped it: it’s served its purpose.
Heather was intimidated. She didn’t get her points across well, she stammered, hesitated and wasted time. She also refused to look at Jane, presumably because she was intimidated, but it came across as petulance.
I agree that media training is essential if you’re going head on with a journalist who has media and campaigning experience.