Get away with

Hi there;
Could yuo please describe more about the sentence below:
"She shouldn’t be allowed to get away with such bad behavior"
I know the meaning of "Get away with" but at the mentioned sentence I didn't get the whole of sentence.

Meanwhile your "Rich Editor" below of "Ask a question" window, I think have a problem and whenever I am using "Rich Editor" and sending my question to your forum , I see my question have been iterated several times and your administrators think that I've sent one question several times!.
it's my opinion about this problem and you can check it out and as I said I have faced up with this problem and I think same as last question I had used "Rich Editor" to format my text in the better way and understandable.