Trapped within a song (twilight and vampire diaries cross over)

When Nessie was born she wasn't the only one. Her sister was also born from Bella and she was... different. Nessie came out crying while poor Leilah was born as if she was asleep. This scared everyone but in the end they thought "hey she's probably gonna die so let's leave her for death". When Bella woke up they decided this but before they could Bella took Leilah. Put her in a blanket and asked a vampire she met take care of her. Leilah grew up with the care of Rebeka Mikealson, the original female vampire. Rebeka was happy to take her and soon found out about her abilities. What happens when the Cullen's move to mystic falls and find their dear Leilah alive and well? Bella of course knew which explained her happiness of moving there. What happens when the Vampire Diaries gang finds out? Also why is it that every song Leilah makes and sings has a sad story behind it? Just what is Leilah's past? Why is she so hurt? Why is her mother the only one who cared about her in the family?