I'm curious - is Princess Sibylla Sybilla in English?
Anyway, I haven't either got very much information about her. Is there a biography or something?
My impression of her is based solely on the photos in which she looks very cold and distant. The death of her husband must have been a shock to her, leaving her alone with five children. It sounds a bit bad that Sibylla's son King Carl XVI Gustaf has told in an interview that his nanny, Ingrid ”Nenne” Björnberg, was like a mother to him. While Sibylla was always away on duty, perhaps. This sounds like she would have had an active life after becoming widow.