Hi there!
I'm sorry to hear about the häçking incident your aunt experienced. It's important to act fast and take the necessary steps in order to protect your account.
Regarding your concern about getting the Gcash username of the häçker, you can try reaching out to GCash customer support through their official channels such as their website or social media accounts. They may be able to help you identify the account associated with the Gcash number in question.
It's also important to report the häçking incident to GCash immediately and provide all the necessary details such as the account number and the amount of money involved. This will help them investigate the issue and take appropriate action.
Additionally, it's important to change your aunt's password and enable two-factor authentication on her account to prevent future häçking incidents.
I hope this helps and good luck!