Many of us are older and testing our DNA for our future generations to have. Each company has something available (usually) where you may list a beneficiary in the event you pass away. You will need to find someone in your family - or a very good friend of the family - who are willing and responsible, that will agree to administer your account for you when you are unable to do it yourself and who will continue to administer it after you pass. Learning centers for text help, or call the customer support line of the company you have tested with for assistance and questions about this. You can leave your results to family or friend.
However, if your aunt has already passed and has not made this choice, I'm afraid there may be nothing you can do. They cannot assume that your aunt would like for you to have it, and can only allow you to administer her account if permission was given expressly by her prior to death. Naturally, you may contact the company she tested with and discuss this with them.