Trinity

This kiddo's been around for 14+ years! She died unexpectedly during a fire as a result of a botched ritual, and because of that her spirit is trapped on earth, though it has no idea what she's looking for. She tries to remain calm and take everything in stride as she did in life, but is subject to severe panic and nightmares when the flashbacks hit, and is often difficult and barely consolable. She does her best to hide this from anyone and feels embarrassed and weak when it happens, She had a good family, she thought, She had a great life, she thought.

What happened? How did she end up so lost and betrayed?