Oh, it's okay for you, so you should help me out" attitude. Of course, your DH was spot on with the reverse of that - he works hard for you to have the money as a family for you to be able to stay at home with your kids
But of course it doesn't run to Disneyland holidays or hair extensions - what you spend on shows your priorities.
BTW there is no way she can drop and run if you don't open the door!
In any case, she has had nearly 2 weeks to make alternative arrangements.