The missing Aftons

So...I know Bryan was never Chris Afton but whatever! I made an OC her name is Arianna Afton, she is Chris's twin sister, on there birthday she also had an accident but was burned to a crisp. Her hair was burned all the up until the beginning of her neck. She has brown hair (Like William Afton) and green eyes (Like Mrs. Afton) due to their accident they both died. But what if they survived? What if Arianna had robotic arms and the rest was human and she couldn't age? Find out in le book!