I agree with what the others say.
But the best thing to do to Bigmouth is just SMILE at her.
Don't talk to her if she talks to you, just SMILE!
That will REALLY piss her off because she won't know if you are smiling at her because you like her, or if you are smiling because you are thinking evil thoughts.
I'm telling you...it works everytime!
Just SMILE at them and sooner or later, they will leave you alone