At just three-years-old you were tortured, your family killed in front of you, and you... left to die a slow death in a pool of blood.
But after days of pain, the hunger and thirst hitting you, the fever making your head spin and your lungs stutter, you remember how your father died so you could live, and the desperation kicks in, you can't die now, not when your own father let himself die for you, so, you grab his jaw bone, his jaw was shattered during the torture, so it had fallen off when the skin was starting to rot and too weak to keep his body together, and you begin to dig at the wall with the bone, even as your hands blister and bleed, you keep digging, not stopping until you finally see a tiny bit of light peek through, and you use the bone to smash through the wall, the wood splintering and digging into your skin as you crawl out. Your family weren't big on other people, so you lived deep in the woods, so when you had gotten out, you started crawling through the forest, slowly, painfully making your way through, but you didn't get far. Adrenaline starting to wear off, after only a few hours, you collapse, falling unconscious, you find yourself deep into a fever dream. The events of what all has happened plaguing your sleep.
TF141, having been given a new mission to investigate the mansion deep in the woods (your family's mansion), they make their way over. Not expecting to find much, after all, the only reason for the mission is because some overly concerned aunt had called saying she couldn't reach your family, though she also admitted your family cuts off contact sometimes.
But after a few hours of walking they find you, a little girl caked in blood, cheeks flushed with fever, litered in scars and cuts, bleeding from fresh wounds, and... clutching a... jaw bone. After getting over his initial shock, Ghost approaches.
"Alive but critical, eyes fogged over with fever, covered in splinters, jaw bone is worn down... she used it to dig herself out."