Biggest cause of death is getting the wrong side of a witch, a wizard or a fairy in a really bad mood (usually Eileen). Second biggest cause of death are dragons and associated monsters (there has been whimsical talk about the brutes forming their own trade union - Beasts Against Vegetarianism!).
The Queen and Eileen have been known to put all their own powers through themselves in one go when they’ve needed the energy from this to carry out a very special charm but doing this leaves them drained for ages and so they don’t do this often. The thought of leaving the Kingdom in the charge of the Council makes the Queen shudder. She doesn’t like the thought they could manage without her. Her one comfort is most royals in most dimensions feel much the same way.