She should be more concerned about her own food intake.
On the other hand, it’s been said that “fat bottomed girls make the rockin’ world go ‘round.”
in the immortal words of Spinal Tap, “Big bottom...talk about mudflaps, my girl’s got ‘em”.
Ironically, that was sung by a homosexual rock star (Freddie Mercury).
One explanation: it is called Steatopygia
It is specially a female feature, but it occurs in a lesser degree at men too (in most genetic variations of Homo sapiens, females tend to exhibit a greater propensity to fat tissue accumulation in the buttock region as compared with males).