Ylva Sweyndottir is one of four daughters of King Sweyn Forkbeard, a mighty dragon far from the north. The background idea that is floating on my head around Ylva is that she is a princess of a flight of dragons far from the north commanded by her father Sweyn that is separate and weaker to that of Torch’s(Embers Dad) flight of dragons.
Her flight of dragons, along with settlers from other races lives in the very far north that is almost disconnected from Equestria, similar to that of white dragons of d&d.
So far, she is to be arranged and be married off to a diamond dog prince to solidify the ties of both races, giving them access to the labyrinth of mines the dogs rules while the dogs, having access to her flight, gives them dragon fire hot enough to warm up and even melt the soil that is holding back many of the gem veins that dragons are so eager to eat.
Having a free spirit, and still unsure about this arranged marriage thing, she ran off after a month has passed by with one of her brother(who is going to Equestria), and as of that part is being chased to hell and back by her husband, and thus hijinks ensues……
Still not sure about the jewelry but eh..