@BigGoose
I don't know if you've seen my post on page 4.
My mum described me exactly this way to the doctor doing my assessment about a month ago too.
My mum also could have got me on the pathway as a kid, and didn't, because much like your daughter I got into a routine at school, straight A's, no bother.
When school finished, and college, and then work, that's when I really declined which is why I am now a late diagnosed adult.
It really would have benefitted me greatly to know I was autistic at a younger age so I didn't blame all of my struggles and failings on character flaws that can be fixed and worked on and then reach the point of burnout when I've been against a brick wall for so long. It also would have benefitted me in relationships to know I was autistic and that my needs were not unrealistic or unachievable, just different.
I know that not every child who displays challenging behaviours will meet the diagnostic criteria, and a lot of children who do and do not meet the criteria would benefit from routine and structure, and there are some low demand approaches that can work for children who are simply strong willed that also work for children who have a different neurotype.
In OPs case though, to me, and to many others who have been through the diagnosis for themselves or for their children and have seen the diagnostic criteria and experienced the assessments it's so familiar.