Is this normal "break up" behavior?

Recently my good friend and his girlfriend have been having issues. They have a long distance relationship but the GF gets mad that he works two jobs. They were fighting via texts, and in one of her texts to him, she said, "Whatever, Fuck you, Fuck this, I'm done with this, Don't ever talk to me again."

He went on Facebook to make it "official," and changed his relationship status to "Single."

The next day, the GF showed up randomly at his house at 7 am, pounding her fists on the door and screaming, "I KNOW YOURE IN THERE." He didn't answer the door for her because he was scared that she randomly appeared and woke him up with screaming and knocking. She left for a while and in this time his sister came home (who is also my friend). A while later, the GF returned, screaming and kicking and banging on the door. Apparently she even tried to pick the lock on the door to try to get inside. She kicked the wall that is closest to his room, all the while screaming "ANSWER THE DOOR, I KNOW YOURE IN THERE."

Apparently she did this from 7 am to 4 pm.

I mean, I know breakups are hard to deal with, but this is going a bit too far, in my opinion. Do you think this is a normal thing to do after a break up?

(By the way, somehow this girl got my friend to date her, AGAIN. His sister said that the GF threatened to kill herself if he wouldnt date her. UGH this girl is driving me crazy)