Ms Lestrange? (Draco Malfoy fanfic)

Myra was just a baby when she was stolen by a group of death eaters... including Voldemort...
Voldemort decided to spare her life because that very day, he saw something in her that might help him make his dark army rise.
With nobody to look after her, to everyone's surprise, Bellatrix had wanted to take the child and raise her to be a death eater herself. She cleared Myra's memory and renamed her Pandora.
Draco suddenly gets confirmation that her blood related sister is transferring to Hogwarts.
What happens she arrives? Will she know who her old family was?
More importantly, will Draco tell her about her real family?
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-Disclaimer: The events do not going according to books because I had intended to, it's not a mistake or a mix-up, it's intentional