Squishable fun
Her breasts do look quite remarkable, so full even on the upper aspects.
She is naturally huge. 
While still in the macromastia category, you have to love girls that love having big breasts, and even more if they rejoice with continued growth. Talked to a couple princesses here, both have large breasts but wish they were absolutely huge (you know one). In Europe, they make a silicone internal bra for natural boobs to avoid sagging and keeping the look as if they were wearing a bra. Last I looked, in a matter of like 6 years, it had gone from 2 surgeons offering it to almost all; must be a big seller. Cheap too, like $1200.