You're Scott's sister. A year ago, Void possessed Stiles and kidnapped you but you and him fell in love and started dating, but then Void was 'killed' by Scott.

You had accompanied Stiles to the hospital for his sudden panic attacks and recurring nightmares.

Melissa had taken care of you, and apparently, Stiles just needed a break. Which missed you quite a bit.

While he was resting in a simple room, Melissa let you stay next to him, and of course, you fell asleep leaning on the edge of the hospital bed.

When Stiles, or rather, Void woke up from the sedative, he found you next to him. So fragile and innocent.