honestly - it's just cause she probably isn't feeling particularly bombshell like she may have 10 years ago and she doesn't want to deal with the attention. that'd be my guess. the paps are there and they'll be taking her pics. if she's in a bikini, or in some beach-appropriate garments, they'll have 8 trillion pictures of her all over the internet and everyone will be obsessing over the shape of her legs, the cellulite on her ***, the colour of her back, etc etc ad nauseum.