Welcome to the forum and "welcome" to Pandas/Pans. I've unfortunately been at this for many years, first with my now recovered son and now with my daughter. I home schooled my daughter last year because her health was too precarious. Because it was only for one year and we always had the intention of returning to public school when she was able (for social reasons), our approach was probably different from yours. But I'll share what worked in case it helps.
I think the biggest thing that was helpful was mindset. Like your daughter, mine went from being very capable to being very handicappe