As has been said, they never truly stop growing, but after the first couple years they slow down tremendously.
That said, being that your ball wasn't fed properly during her first few years, she may not ever reach her full potential, but with proper feeding, she will grow. I wouldn't get my hopes up and expect her to ever be a monster, 4,000g ball, though.
BTW, love your avatar. If only that weren't photoshopped...![]()