What is triggering her aggression to you? Is she aggressive when you try to take a toy away, when you are messing with her food, etc.? To curb her behavior, it is vital to know what is causing it.
Dogs are not aggressive for no reason.
As far as what you can do, without more information, all I can suggest are the things already outlined in the article. She needs obedience training. If she is getting aggressive during play time, give her a down/stay command. If she is aggressive during your meal times, have her lie down and stay in one position while you eat. This is impulse control.
If you want to learn more about teaching her impulse control, and teaching her to be polite, read: http://hubpages.com/dogs/teach-your-dog-impulse-co...
The other thing that you want to emphasize is adequate exercise. She is still a young dog, and if she is not going for a walk a few times a day, she has to use that energy somewhere.
You need to figure out what is causing her behavioral changes, but sometimes an improved exercise regimen is all that a dog will need.