According to the minimum pay laws in Illinois, a minor gets .50 less than an adult as minimum wage (if an adult is at $7.50, a minor is at $7.00). You can see all of this at www.state.il.us/agency/IDOL. Matter of fact, most of your labor related questions will be answered at this site, as well as they will tell you how to file complaints against your employer.
s/he can put you in for the raise, but if the company doesn't approve it, then you are out of luck. It is possible that she put you in for it, and due to the amount of the raise, it was refused by corporate. Your manager only has so much control over how much you make