[quote=Extra]
What if we "forced" her body to age? Like, control a part of her brain and activate the natural growth hormones whilst speeding up the process. And when she returns to normal we can deactivate it.
[/quote]

Biology doesn't work that way. If you did that to a normal human, it would kill them, but even if it did age her, she'd still be stuck. She won't age past twelve by natural, or unnatural means. Strangely, I feel that this may have been intentional somehow. Perhaps a side effect of the Scale.