The only constant about her have always been her legs, but that's not her merit. She's a classic apple shape. Every batch of photos I see of her she's either lost water weight or gained it, which is immediately visible on her face-arms-mid section. One day her face is round, the next day she has cheekbones.
Her face looks fantastic, but her stomach has totally ballooned
It's probably heavy workouts (notorious for provoking water retention), stress, lack of sleep, jet lag etc. She's obviously prone to holding onto water.