This doesnt qualify for compensation under EU law. You were flying into the EU not out of, on a non-eu carrier.
Just be thankful that they provided a hotel. Yes, you should have called in and demanded to be put on another carrier, or another routing that you researched beforehand, to get her there faster than 24 hours. AC wont provide you with a solution that will cost them money.
You will get a 10% discount code when you write in (which is on base fare only - so maybe 6-7% tops) - you can decide if its worth your time.
Otherwise, simply dont fly AC again if you dont like how they handled this.