The problem here is she's hanging onto being skinny. Women can get away with it when they're in their early/mid 20s, but by the time they hit their 30s the collagen is starting to deplete in their skin. With a bit of extra fat (lipids) it 'plumps' up that sagging skin and fills it out. Give her a few cheeseburgers, fatten her up a few pounds and it'll make a huge difference.