It should be remembered that the most NT of teenagers will invariably have meltdowns. That's par for the course.
I'm glad you both have the ability to communicate so well.
Could it be that, maybe, you didn't "cause" the meltdown? Maybe the meltdown was caused by stubbornness. It seems like your daughter might have had a realization--which is why she was willing to sit down with you and discuss the "better strategies."