Thanks for all the details! DD does like CTY online demo as it's presented in such an efficient way.
Do you have experience of EPGY writing and LA lessons?
EPGY math is a fairly complete curriculum. By contrast, EPGY LAW (language arts and writing), although good for grammar and OK for reading comprehension, needs to be supplemented. EPGY LAW will ask a student to write a few sentences on a topic, selecting from a palette of words, and then say the response is correct based on whether it is grammatical (not whether it makes sense or "flows"). EPGY LAW is fine for topics in grammar with clear-cut answers. I would not trust any fully automated writing curriculum. There are online writing courses from CTY in which a teacher comments on a student's writing.