She doesnt go blind and the magician doesnt steal her eyes. I think he tried to take her eyes because of how rare they are but im not sure. She does get kidnapped so once she goes back to her family shes traumatized and completely devoid of emotions thats why her eyes look so dull And lifeless.
Nope. Those eyeballs were fake and were sent to her family as a threat or something. The reason she was in a daze-like condition was because she did something to her mind to numb out the pain. (According to the comments, it might a similar to Out-of-body experience. I remember her having a flashback of a TV show of her past life) After returning to her family, she was desperately trying bring her conscience back (by hurting herself) On the other hand, everyone thought she was like that because of the trauma and was suicidal. (Especially Emiel blamed himself a lot)
Ok so spoiler (i think) with theory
Spoiler here i think
Stop now if you dont want it
I kind of read in a page that she goes blind. Is this it ? Σ( ￣□￣||). It was said there that she was kidnapped by a magician or something. And i think it also said that they took her eyes(?) which caused her to be blind. Could it be for the princess' eyes