Older Amy, The Doctor and others in “The Girl Who Waited”

Right, okay, this is big news. This is temporal earthquake time. I'm now officially changing my own future. Hold on to your spectacles. In my past I saw my future-self refuse to help you. I'm now changing that future and agreeing. Every Law of Time says that shouldn't be possible.

Yes, except sometimes, knowing your own future is what enables you to change it. Especially if you're bloody-minded, contradictory, and completely unpredictable.

So basically, if you're Amy, then.

Yes, if anyone can defeat pre-destiny, it's your wife.