You were 7 years old at the time. Bitten by an alpha of another pack. You didnt know what happened. Someone had saved you, Scott Mcall. Him not knowing what to do because clearly you weren't dying and instead you were going to turn into a werewolf, called Derek and immediately went to his loft with you. Derek looked at you, then looked at Scott, then back at you

"So you expect me to baby sit..?"

he said with a slight amused expression on his face, Scott quickly responded "no. I want you to keep them. I can't train a child, and where would I keep them, you have a whole dang loft and much more experience than I do." Derek just looked at him with a look that said "the audacity"

"Im not very fond of children, Scott."

he said looking down at them who was hiding behind scotts leg. Scott responded "ok well if you don't take her in they're gonna run around killing everyone and everything that moves on the full moon." Derek finally looked at the child before speaking

"I guess they can stay with me. They got a name? Family?"

Scott then responded "no family, orphan actually, not sure about their name. They haven't spoken a word. And please be nice. Don't scare them. I have to get to school so im leaving them here." Before Derek could respond Scott was off. Derek looked down at the kid before his eyes began to glow a blue color