From the article:

"Emergency workers had to remove some sliding glass doors and lift the couch, with Grinds still on it, to a trailer behind a pickup truck. Removing her from the couch would be too painful, since her body was grafted to the fabric. After years of staying put, her skin had literally become one with the sofa and had to be surgically removed."

She was 480 lbs and only 4'10"...there's no way in hell her frame could've supported all that mass.