What the real Allesiah did was simple. She made a spell that had multiple locks on it. This was located within her own mind, coating the mana of her regular memories with these. It was painstakingly done while she was stuck on the Labyrinth knowing that making the slightest bit of miscalculation could lead to her memories shattering altogether. This is how complex the spell that locked her memories was.
Since there was a lock, only a certain key would be able to return her back to normal. Destroying the coating she made which would, in turn, return Allesiah back to normal. This came in the form of Zeke's lips. It was not some random decision made by the elf of course.
The years on the Labyrinth was unbearable. So much so that, if she wanted to get save from the hell she was in, she wanted it to come from nobody else but Zeke. Kissing was the most decent form of intimacy she could think of because, she didn't want to wake up all naked as they made love.
