Should my friend be mad at us?

[lisa]

Okay, so me and my roommate were hanging out with our other friend, and she used my roommates computer to check her Facebook. After she left, we figured out she hadn't logged off her Facebook, so we decided to have a little fun. Now, all of us that hang out together have been hacked multiple times by our friends and we always laugh it off because it's a joke. Well, we changed her gender to male, changed her birthday to that day so people starting writing on her wall, and made a funny profile pic and cover photo. It was super hilarious, and it's happened to all of us, and she's been a part of doing it to other people before. Now she's like seriously pissed at us even though it was a joke. Does she have a stick stuck up her butt or are we in the wrong here??