Wearing a wedding crown is a Swedish tradition for all brides, as is wearing a crown of myrtle leaves and candles at Christmas. A comment at this site says:
One older Swedish wedding tradition is for the bride to weir a small golden crown with her veil. In fact, when I was married (in the US), my mother "borrowed/rented" a real golden crown from a Swedish jeweler and brought it here for my wedding. Pretty corny, but then again - gotta' love those traditions!
As for this wedding crown, the cameos appear to be silhouette portraits of past queens. It is one of their nation's high honors to be eligible to wear it, as she is Sweden's future queen, not an ordinary bride. So it will only be worn by one to three women in the lifetime of the average Swede, i.e. her mother, herself and possibly a daughter.
Many of us in America have never seen a genuine cameo, which is a work of art hand-carved into the layers of a sea shell. Along with the pearls in her wedding crown, seashell is a nod to the large coastline and seafaring history of Sweden. When a shell cameo is worn on the neck, it is opaque; but in this crown, light would shine through the cameos from the back and would make it quite luminous to the guests in the room. Here is a typical European shell cameo: 
If her crown appears to be "wearing her", it is fitting that she is willing to bow to the duties of her position. Wearing it is an acknowledgment of her people and their history, not merely a focus on stylin' or self. We have seen what train wrecks Princess Diana and Michelle Obama have been in putting fashion ahead of the discretion expected of national leaders.
Fashions come and go, but crown jewels last for centuries, as does the royal custom of hand-made lace wedding veils that take scores of women (traditionally nuns) a year to make. Again, a nod to the artisans and Swedish heritage.
I agree with you about the lovely dress and how artfully it is made. With the dress, she says she is also a contemporary woman, but a tasteful one!
By the way, as her personal trainer, he certainly did a great job on her body!