Nancy and the Andalasian Diamond

In the land of Andalasia, in a river just outside the forest that all of the animals call home, there hides a jewel that holds powerful magic. Magic beyond imagination. Magic capable of both good and evil. Magic lost in time. Magic desired by all who seek it, especially the previous queen of Andalasia who was believed to have been dead...until now.
Queen Narissa has been in hiding ever since she had failed to prevent her stepson Edward from finding true love and taking the throne from her. She has been plotting her revenge for the past ten years, and she needs the diamond's powers in order to accomplish it.
What happens when Nancy accidentally finds it one day?

I do not own any of the characters from the Enchanted franchise.

(Also, this tale has been DISCONTINUED unless one of the readers decides to write their own new version of what happens next.)