shes (in the novel) a siscon to the bone
SPOILER
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Diana is the sweetest little bean! The dad is a monster who kept them apart. Diana has always loved her sister and was always trying to share everything she had with Ancia, but if she did then the father would beat Ancia and accuse Ancia of manipulating Diana to get what she wanted. No matter how Diana protested and tried to defend her it would just make the dad punish Ancia worse.
In the original novel, Ancia's death left a massive sorrow in Diana. She even ran away from home because she couldn't forgive the dad for the way he treated Ancia and became a maid in the palace (which is how she met Blake in the original novel). It's implied that in the original story the reason she didn't choose Blake over Richard is because she couldn't marry her sister's husband.
In the current timeline, Diana is so happy to see Ancia doing well and flourishing as crown princess.
Blake, Ancia, and Diana are just all sweet, precious cinnamon rolls who are too good for the world.
WE LOVE AN MC THAT CAN DEFEND HERSELF!!!! Also, I cannot wait to see her little sister! I heard some good rumors saying she’s a pure Angel with a sis con heart and I cannot wait to see it!!(≧∀≦)