I'm sympathizing with the passenger on this. Her bag is long by about 3" in the length dimension, but appears much smaller in the other dimensions. With that in mind, her bag will still fit length wise as it isn't tall enough to deal with the curvature in the back of the bin. She is a 1K, and likely never had a problem on previous flights. The photos of the GA give me the impression that cranky is her middle name. I mild ounce of common sense from the GA would seem to make sense IMO.