I brought a car in my name for my sister will i be responsible for the payments if she no longer wants the car?

we both agreed that inorder for me to get the car for her that the payments would have to be debited from her checking account, and that she has to insured the car. The dealership registered the car in her name. But I am the only one on the title with the lien holder. She has been making payments on the car since the date of purchase.