Your girlfriend? Really? It's always a 'friend' or 'roommate'. I'd make sure your 'girlfriend' isn't using the same computer and IP address of that will likely be found as ban evasion. Isn't the lontong account yours as well? Edit saw it is linked in the link above.
This is something new that I saw. Is it like people using two accounts simultaneously from same computer and IP address will be banned?
I thought that simultaneous accounts are allowed to be used on a single PC with a single IP address only, as I have seen many people selling accounts, so how they are doing it if the accounts are to be banned by Mods?
It is not an account that is banned, it is the person who is banned. So regardless of the IP address or the computer that is used, if a person's account is banned then that person cannot post from any of their accounts (the exception being to post in meta in order to appeal)