Should I be mad at my best friend?

[Kristine]

Well... My best friend basically found my password for my facebook, and using that, she went on my account. She changed my profile picture and cover photo to weird yet funny pictures. I was laughing about that, I mean, I didn't mind. It was funny until she went a step further. She updated statuses saying some weird pick up lines. At this point, I was a bit uncomfortable, but I was still fine with things. Then I found the messages she sent to some of my other friends. Then I got angry. I felt like she invaded my privacy TO THE MAX. She could've read my previous messages and I felt sick and disgusted to think that she would go that far. I confronted her, and she showed some attitude to me. Then she said sorry and I said it was okay. She just said "whatever" which infuriated me even more. It basically sounded like she didn't care or mean the apology. I told her this, and she replied "Okay sorry" like WHAT. I felt like she was mad at me for no good reason and I cried ( I've been depressed before so I still cry really easily, but only when there's nobody around me). I still feel angry, but I'm not sure if I'm supposed to be the one that is mad?