The mother was the most annoying character I've seen in any animated film.
I understand overprotective parents, but there was no logic with her. She would witness kids laughing at her daughter because of something she did, and yet she continued to embarrass her throughout the film. She wasn't oblivious, she was just overprotective and didn't care. She kept getting kicked off the school grounds by the security guard, but she continued to come to the school to embarrass her.
There's a fine line with being overprotective and being completely ignorant. At times I even felt like she was a stalker.