Did the white witch die at the end of Narnia?

Well, yes and no. She is rumored to be the daughter of Lilith, Adam's first, rebellious wife. The other part is fallen angel. So like in Nimrod, she is half demon and humaniod. She is a giant. A fact the movie fails to depict, but she is beautiful beyond belief. However, she is pure evil. The reason she knows about the children of Adam and Eve is because of her evil mother and biological demon, fallen angel father's vow to destroy mankind. Jadia, the white witch, gets her warrior side from her father, but her race is cursed and awaken by the ignorance of a human child.

If you read The sorcerer's nephew (the book in the chronicles of Narnia before The lion, the witch, and the wardrobe), You will find out she is actually a queen from a different dimension who was taken to Narnia before it was created by Aslan's song.

The witch was taken to Narnia by the two protagonists of the story. Ironically, she is the reason the pole Lucy found came to excist.