My guess is that the very best choice for your daughter is
Insight School of Washington. Your state is one of the lucky ones that has a free online charter school option available.
Insight Schools are busy offering programs in a number of states. It was bought not long ago by the same company that owns the University of Phoenix.
I would caution you that just because it is free does not necessarily mean it is your best choice. You will want to look carefully at it, but also look at some of the other choices on this site. There are some excellent schools out there and, to be honest, Insight is fairly new. That does not mean it is not a good choice, but you would do well to
look around.
As to schooling & homeschooling laws in your state, I am not sure what the rule might be, but if your daughter is in 8th grade, she certainly needs to be in some kind of school whether that is online or off-line.
Questions?
Tom Nixon