I think you are not aware of the big elephant in the room, which is your child's ability to function in a school setting. My daughters high school tested her and placed her in classes based on the results. And IMO online courses in many ways are not the same as the education that one would receive in a competent school. Then there is shopping for another school to consider.

I have made my daughters schooling a number one priority. She is now in one of the top three schools in the city. And yes, it is a public school. She is functioning there better than any other school she has attended. Their courses are advanced. This is causing her deficiencies to show up in her ability to handle some of her classes. This is a good thing. I am now working with her on these subjects. Between me and school, she is receiving the best possible education that is available to her.

Just food for thought.