NSFW #1:
Her slowed muscular development lead to an increased accumulation of fat...
Her breasts are not only larger than her head, they're far more tender and squishable than most of their size
SFW #1:
She's a mere 4'0" if you don't count her horns.
She took longer than most to develop her immunities, so her muscular development was affected leading to a natural shortness