I would imagine (unless the host of the show is a monumental tosspot) that whether or not Helen wished the subject of Le Vell to be mentioned and precisely what she could/should say was discussed with her beforehand.
It sounded like it was pre-arranged. She just got confused. Bless
edited to add: She also said during the interview that's she wants to write a book about panic attacks, anxiety, eating disorders, body image and 'stuff'.
That's gonna be some book.