What on earth is wrong with this chick?

My friend looked at her and she just went nuts..."Why the f do you keep staring at me...tell me what the f you want from me! I don't like you I think you're a creep! Stop staring at me..I can see you from the corner of my eye staring at me all the f'n time! What the f do you want! Then she raced out crying. What's wrong with her? These people were all talking and were taking up the hallway and my friend was one of those people and I was waling behind her trying to get through to go to our next class..and she's like, "could you get the f out of the way, you don't own the f'ing hallway..get the f out of my way" and she targeted him. Why does she hate him so much