I was online trying to hack into someone's email
Was it even possible to have someone's email?
I can't really remember, I think so.
You shouldn't break the law by hacking. You should practice legal activities online, especially if you don't remember the things you did. You can go to prison for hacking into people's personal accounts.
I know for sure that I hacked her.
I really hope you didn't, because hacking is quite criminal. Cyber crime is rightfully getting more heat these days, and doing such things can land you in jail. If you have a problem with her, why not send her an e-mail to discuss things instead of messing with her accounts?