Gillian was born in Sweden and it was there that she learned of her ability to freeze things. She was taken in by HUSH when she was a child and taught to utilize her ability for the organization. It was there that she met her partner Fritz and where their strange friendship began.
Ability to freeze things in place by pointing at it and focusing on her thoughts on freezing it.
Trivia- Due to her rather cold nature to first meeting him, Fritz actually called her "Ice Queen" and she actually giggled at the name and decided to keep it as her codename.