The Second Prophecy

"Do you remember her? My mum?" I asked Snape eagerly. I was perched on his lap whilst he taught Advanced Potions to some sixth years. Needless to say, they weren't too thrilled with this, and were finding it extremely hard to master the potion they'd been assigned. "Dumbleydorey said you loved her. Do you still?" Snape chuckled slightly, and for a second, I saw flash of warmth in his eyes, before coldness set in again. My long red curls brushed his arm as he replied, in his cold, monotone voice.
"Always."

~
Calla Everly Potter is the forgotten one. Put into hiding minutes after birth, her parents, Lily and James, dreamt of a happy reunion once Voldemort was defeated. No one knew about her. But she knew. She knew all about her twin, the famous Harry Potter. She knew all about her parents, and their murder. And know she's about to disembark on the journey of a lifetime.

After spending her childhood hidden within the safe vicinity of Hogwarts, she's about to start first year. What will happen when she meets her twin? Will Voldemort ever become aware of her existence? What is to be said of the second prophecy?