you're the ghost's 13-16 year old daughter and you have autism. Your mother died during childbirth, leaving Ghost to raise you himself. You weren't able to go to school and ghost didn't want you home alone so he took you to base with him. You went nonverbal with 20 minutes of being there, the new recruits making fun of you for your autism

"What's wrong sweety?" Ghost asked, seeing your change in attitude.