is the infant in her own seat on the plane? It's really hard to judge with the airfare and the rental car. Disney's prices are pretty standard when you know which season, which hotel. Then AAA has a straight percent off depending on season/hotel (mod resort, 15% peak ,regular,and summer, 20% value) . AAA discount for Disney is on the room part but everything else I wouldn't have a clue about. Did they break down how much each part was costing you?
So more info to help others help you - How many plane tickets?
Are you getting park tickets? What kind? Dining?
When are you traveling?
Lets assume you are holding the baby on the plane, and this is room only - no tickets. 6 nights at a mod in value season with aaa discount will be - 783ish. That means you are paying about 1187.56 for the rest. Taking off insurance you are at about 1000 for the plane tickets and rental car. Yes I think that is a lot. but if you are going in Peak season it still leaves you paying well over 600 for 2 plane tickets and a rental car. Which seeing some of the rates people say they have been getting still seems a bit high.