Hey 888hama,
Sorry to hear that someone else accessed the account. It's definitely frustrating to lose access to an account you've poured money and time into!
Please use this link to create a case and select the 'Continue as guest' option before filling in the relevant information. Submitting the form will redirect you to a page with more support options, where your girlfriend can connect with our live support team. They'll be able to help recover the account after verifying her ownership. Do note that your girlfriend should be the one to provide the information during that conversation, as it's her account that needs to be recovered!
Once she gets her account back under her control, please be sure to go through as many of these security steps as possible to further secure the account.
Let us know how it goes, thanks!