Just a caution, even if the school is accredited, it may not matter. Our local high school will not accept any online credits for high school courses taken prior to 9th grade and will only accept credits for high school courses taken through a university (BYU, Mizzou, etc) in grades 9-12. I would be sure to get the policy from your district in writing before investing any time and money.
This is true in my district as well. The only courses accepted for credit before the student if officially enrolled fall of their 9th grade year are the districts own summer school classes. Although an online class might be used for placement in math or a foreign language. Can you talk with the school you hope your daughter will be enrolled in?