You would need to Activate your account. If you used the method below to deactivate the account, you were given an alphanumeric code, which must be used to activate the account again. In addition, make note of what happens when you do not sign out of an account before deactivation:
- Make sure that you sign out of all your devices to avoid issues with apps that use your Apple Account or iCloud. After your account is deactivated, you can’t sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device while your account is deactivated.
How to deactivate your Apple Account - Apple Support
The only possible remedy at that point is by using the original purchase receipt and your Aunt would have to use it to remove the Activation Lock. Without that information, the device will not be able to used and you are not able to bypass the Activation Lock.