[Allogagan]

If a person grows proportionately they would increase their weight by a factor of 8 for each time they double in height. Since her weight is really her volume which is a 3d figure.

((H2/H1) / 3 ) * W1 = W2

or New Height (H2) divided by Original Height (H1) the rasied to the 3rd power (/ 3) times Original Weight (W1) equals New Weight (W2).

example

((10ft/5ft) / 3 ) * 100lbs

((2) / 3) * 100lbs

8 * 100lbs = 800lbs

a 5ft woman who weighs 100lbs when grown to 10ft would now weigh 800lbs.