post a pic, best way to tell.

We can't tell just by weight and age if she is obese.. length is a big factor in what she should weigh, but eyeballing the shape of the snake is how you tell in most cases.

Corns, in my experience, are easy to overfeed. The one I had as a kid was an eating machine, and always seemed hungry, even though she started to get a bit overweight, and I backed off her feeding frequency.