Wait a minute, Shiori...Are yo younger than 18?
People can grow a bit even into their mid twenties. It's usually much less than during puberty and more pronounced in males, but it can happen to both, depending on the rate and style of one's epiphyseal plate closure. You can also all but stop growing well before the true end to your puberty. Biology doesn't care much for strict and even limits and everyone trying to set those upon it (past generalization or standardization) is more often than not an abject idiot.
...But yeah, mostly, she's looking to grow
larger than anything else in all likelihood. Here's to hoping her already
bountiful and
favorable genetics stay that way in that case.