My 15 yr old says that all the time when it comes to chores. 40 hrs a week at minimum wage doesn't get you an apartment it gets you a room somewhere shady. She should contribute to the house.
Sit her down and calculate how much it'll be to get her own place. Remember she needs First, last and deposit just to move. Then $400 for food/water, then she can only get a place that's 1/3 her income (or she wont be approved), Car insurance, medical, Tv / internet, $100 for house hold things, gas for the car, $100 saving/extra just in case something happens and $150 for electric.
What we plan to do when my son is 18 (if he chooses not to go to school) is take 1/3rd of his check save it and give it back to him when he's looking to move out. It will take about 9 months of payments to get to first, last, and deposit. He's not going to know we're saving it until he moves out.