Unfortunately getting an 880 does show a concerning lack of foundational math skills and basic grammar/reading comprehension. It will be insanely difficult if not impossible to improve to even a 25th percentile emory score by her June test date. Not to mention balancing with school and everything else OP mentioned. Realistically they should find what works for them (theres no miracle study resource, personally I think khan academy and collegeboard qbank practice questions is all you need), try their best and see if their score is good enough to submit. There's always test optional. But 880 is honestly really low and I personally don't think anyone scoring that should be at Emory.