You'll get your money back.

Just takes 7-10 business days after filing for a refund for a manual review and credit back to card.
If in fact you cancelled the trip and filed the online refund form correctly- and your refund was due to a major schedule change - your're good.
No further need for action - by late next week you'll see your credit.
This problem is not specific to AA - it's just a super slow process getting your money back from an airline.