She doesn't make mistakes, she blatantly ignores absolutely everyone because she wants to show them how awesome she is, but just endangers everyone around her. Take a look at this season when she went to go learn how to guard the wall of the town. Instead of staying on the wall like instructed she jumped down and fought the zombie hand-to-hand like a moron and ended it with, "and that's how you do it."

It's a pity, because in the comic she's one of the best characters. In the comic everyone makes mistakes, that's the point; It's bad writing to make you have to hate a person because they constantly make mistakes.