A theory - the Men in Grey Suits did it.
The Queen is well known to have a team of men, who Princess Diana affectionately called the 'men in grey suits'. She expressed in a joke that she was worried she would be murdered by them one day, as they followed her around, spying on her, dictating to her and running/ruining her everyday life.
They are spin doctors on steroids and will fix anything for the Royal Family, and will happily sacrifice a slightly embarrassing secret of a minor royal in order to keep the big secrets that could bring down 'the Firm'. They are careful not to cover up too much, as their presence becomes obvious, but don't cover up too little, in order to keep us assuming the Royals are transparent with their interests and agenda.
I (personally) believe their 'fixing' and 'cleaning up' has possibly extended to murder once or twice. Maybe not Princess Di, but others. There have been many people who have made outrageous claims involving the monarchy over the years, who have suspiciously gone quiet when shit started to hit the fan, and the general public began coming along for the ride.
I'm not saying I believe this for definite, but if Dirty Andy is as bigger player in this as we all think, and he may well be, as Her Majesty's well known favourite son, running to her begging for someone with a license to kill to do something to save him and his family isn't very far fetched.
Her Majesty goes to extreme lengths to protect her own, keep some squeaky clean, others just dirty enough to be down to Earth and likeable (for example, future monarchs), and is pretty obvious in her quiet shade regarding people she is not a fan of (i.e making Meghan Markle live in a small cottage in the grounds of Frogmore house, in which grounds, the remains of the last American woman to break up the Firm are buried).
And if these paedophile rings are all connected worldwide, Prince Charles, one day to be King Charles *shudders* gallivanted very publicly with prolific mega-paedo and general sociopathic sadist Jimmy Savile for a very long time. If this is the case, to keep her little Andy clean-ish, and the heir clean, she would need to do some cleaning up. This is where poor Diana's men in grey suits come in.
One squeak from the wrong person could ruin not only her favourite boy's life, but his wife Fergie, for whom Her Majesty holds quite a lot of affection for, even after her behaviour in the past twenty years, and by proxy, the lives of Princesses Eugenie and Beatrice, who are said to be extremely close to her majesty. This coming out will tarnish the reign of who is thought to be the best monarch this country has ever had, it will tarnish the reign of future King Charles, if he ever gets to be King, and if the monarchy survived, it would tarnish the reign of Wills, and possibly Prince George too.
There is a lot to lose for the monarchy if the men in the suits can't sort this out.