I have an ADHD diagnosis and I'm waiting for an Autism assessment. But I'm pretty much certain I'm somewhere along the spectrum.
There's plenty of articles and books out there regarding the neurodiversity, ADD and the spectrum. It's good to build up your knowledge of the disability which will aid in understanding, patience and support for your daughter.
If she doesn't want to see a specialist, I think forcing the issue could be counterproductive. Also, ABA (my assumption of what specialist might mean) has a bit of a problematic approach in terms of promoting masking, attempting to reduce behaviours that are natural to someone on the spectrum.
Later in life there might be an increase in social struggles, and keeping up with the expectations of teen and adult life. Problems like self-care, keeping her room tidy, getting overwhelmed at certain social events, or crowded environments, struggling to pay attention in lessons or when doing tasks that don't spark her interest.
Nurture her "special interests" and help her to see that these disabilities hold many merits, and allow us to think, process and live our lives on a different wavelength to others. It comes with struggles and pitfalls, but these can all be researched from articles and books, and will allow you to better understand and handle things such as meltdowns, shutdowns, burnout and possible co-morbidities such as anxiety, depression, dietary issues etc.
I'll share this too. I've watched this many a time and it made me tearful the first time I saw it, as he's a specialist in ADHD and he describes it in such an accessible way. It's nice and fundamental to be understood in life, both understanding ourselves, as well as those closest to us understanding who we are:
All the best,
Ed