I would have Tiffany and Cora catch her unawares at home. They would take her to the backyard and scold her for not sticking to her diet, telling her she must be punished. With that, they pull out some five-gallon tubs of 'Boom' serum and start forced-feeding her, watching her grow ever large and firmer, so none of her beautiful fat sags at all...not with all the inherent hydrogen keeping her firm and pneumatic. I'd have them run their hands over her while pinching and stroking her body until she was so swollen her hands couldn't reach her belly. That done, they'd start painting a series of lines and grids on her naked body and tell her they're going to play a little game called 'Star Wars.' They'd place a small little time bomb on her belly, throw in a DVD of the 1st star wars movie, fast forwarded to the final battle scene, and tell her she has until the Death Star goes "KA-BOOM" to get the teeny-weeny time bomb off her...assuming she's capable of movement.
Oh, and then Tiffany and Cora run for their lives.