Not every trained dancer can be graceful and amazing. But looking at the way RG dances she doesn't look trained in classical dancing. Or it is possible she trained for just 2-3 years. Such a short training is not enough to master classical dancing unless you have some inborn talent.
It just looks like a nondancer trying hard.... 
Age also can make the body a lil stiff. The problem over here is that they show people and children getting besotted by her classical dancing and then don't match up to those standards.. Semi-classical or just simple yet innovative steps can also be very impressive. They should have tried that instead of making these tall claims. But then again tall claims are everywhere from managing big business empire to managing world's biggest problems ..