When someone on the Autism spectrum, it is not completely a yes/no diagnosis. It is a spectrum as you seem fully aware. Unfortunately many others who read these reports and make decisions are not. When a child is on the cusp between being on/off the spectrum then changes in life can make the symptoms swing one way or another. These changes can be like developmental jumps, therapy, learning new skills that make them seem more NT, or they may be entering a new developmental stage where their deficiencies are more prominant, stress in life, hormones from adolescence, more demands/expectations because of their age make them seem more autistic. So, a good evaluation will take this into account, what is the history, what have they learned in therapy, what is happening in life. There seems to be a common pattern that can happen with some people.... Autistic traits lead to a dx of autism when young, improved skills and developmental leaps allow them to almost catch up to peers so they lose the dx or don't seem autistic, then the social demands of tween and teen years occurs and their peers leave them behind again. They can then be dx with Aspergers or HFA because the differences between them and their peers is now apparrent again. In fact Aspergers is most likely to be dx in the 11-15 age range, because that's when the differences become so obvious. If a new evaluation will help her get better services, then I say go for it. We need all the help we can to help our children keep their grounding and not get lost in their adolescence.