I think their "wonderful relationship" disintegrated when Fern made her public confession about having a gastric band on TV with PS having to stand beside her, looking at her and not daring to look at the camera. That really was cringeworthy.
Yes I think the arrogant way she handled that whole fiasco did her reputation a lot of damage. That and her biography which was an eye-opener regarding her character and behaviour. I think the two things together did her an awful lot of damage. Sad, I loved her FERN MEETS on BBC. Why was that cancelled? She is a good interviewer, I honestly do not know what happened to her career!!