Very interesting research. Her fathers mysterious death in 1991 is fascinating research.
But not unexpected. I was a WSJ subscriber at the time.
His house of cards was on the verge of collapsing. He was suing (under British law) every reporter and investigator for slander and libel that was looking behind his curtain of fraud.
When he disappeared, I thought he was faking his death to live out what remained of his "golden years" free, and not in stir.
Boston talker and paperboy, Howie Carr said that a joke on Fleet Street (London's newspaper area) going towards the end was "Not to take any 'checks' from him" (Maxwell was originally from Czechoslovakia).