Sorry geezer, you have lost me there........ there is only one variable that is unknown here, did she have other problems that lent themselves to her taking her life? If it emerges in the fullness of time that she didnt, that she was a happy person in a fine family relationship with two children and a decent career, then and only then can we know for certain that the prank call directly led to her suicide, until then I will reserve judgement on the issue of blame, not that my opinion matters much in the grand scheme.
It has been said that there were a set of circumstances that have triggered her tragic suicide.
The variables to me are quite irrelevant because none of them could have foreseen her actions and none of them were sinister, intended or likely for her to take such an extreme action.
Maybe worth a look at the hospitals original reaction to her role as the 'duped' and then the presses intrusion thereafter, but non is going to offer up much, other than sadness at the eventual outcome.