As if she even she even didn't listen Sigurd when he said "Don't go out the castle,you have to take care of Seliph."
Not only did she not listen and got kidnapped,her memories were erased!But then,just when Alvis was going to kill Sigurd,He gets Deirdre out and lets her see him.But then,she remembers that she married Sigurd,but Alvis wouldn't let her touch him.So,she was killed 17 years later by her own son,but since minor + minor =major,Julius called her by "Deirdre".