How did Jackie the ghost girl on the Queen Mary die?

Jackie is a young child who drownded inside the second class pool and now haunts the first class pool. some say she was murdered but she however was not she got caught in something and drown you can clearly hear some of what she said from various voice recording she says "I'm caught."

she will sing, play hide n' seek, and flicker lights every now and then she is completely harmless, for now.