Lovesick Witch LSW

She's a witch. She's lovesick. Everyone warned her not to give that prince charming her heart but she did. In exchange for doing that, her heart was ripped apart, crumbled to pieces by the hand of the one she loved the most.
She's not innocent, sweet, and bright like the princess the prince loves. The ending of her path was an endless prison in the black tower watching them leading the empire together.
"Reynold...you betray me...I swear...when I get out of here, I'll kill you!!"
But fate always messed with her, when she set her foot out of the black tower after five years. The whole empire she had been protecting for over a millennium turned into the frozen land even the prince.
What happened to the empire?? What was going on during the years she was imprisoned?
Will she be able to take her revenge and kill the one she loved? Or will she love him all over again?