Give us a run down on your care of her. Temps, humidity, substrate, soakings, diet and size of her bottom shell, head to tail and someone might be able to tell you if your on track or if you should change some things.
Hi, and welcome to the Forum. How fast a sulcata grows depends on how old it is and how it is kept. If you can tell us more about your tortoise, how it is housed, and what you feed it we can give you some pretty good feedback about it's health.