When Perrie Edwards starts sending letters to "Her", Her being a person she made up, She never thought, she'd answer back, let alone be a real person.
So when Jade Thirlwall, Jade being "Her", died when she was 16, but as a ghost, could be brought back to life, with love, she died of a broken heart.
So when the Love ghost, Jesy Nelson, starts getting letters for "Her", She felt Jade didn't deserve to die young, and gives them to her so she can come back to Life.
Love
Life
Strength
Memories
Death