This story is a sequel to The End Of Chaos
Screwball lost him. She had lost her first friend and her daddy. After hearing the conversation between Princess Celestia and a group of ponies, she had set herself on a mission to find her daddy and free him. Will she get him back or will she lose her daddy and her first and only friend?
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I think it's saying a "heart" because ScrewBall is a child, and she just doesn't realize that it's actually pronounced "harp".