I’m sure she does more exercise than people realize, she is a model after all. But if I had to guess it’s probs a combination of getting older and exhaustion. The top models do more traveling, filming, partying (not in a negative manner) and stress. I’m sure it’s a taxing lifestyle and that could play a part. Still a GOAT tho no doubt
She's also probably lying about her age by a coupe of years. I'd put at closer to the infamous 27 (the age old Hollywood would drop an actress for being past it) then 20. These type of girls are inhaling all kinds of things too. It all adds up.