Yeah... sour grapes are never popular. Sinclair has ALWAYS been very quiet and humble when it comes to talking with the press, so it was very unusal for her to say something like that.
To be honest, I think more than anything it was about her being so fiercely determined to win the game and her doing pretty much everything humanly possible to do exactly that. It would have been the biggest moment in Canadian soccer history (men or women), and against the team that they have never been able to beat - not even once - in something like ten years.
It was the product of the disappointment of going ahread three times throughout the course of the game, only to lose it on a fluky corner kick goal (which she was *this* close to stopping) and back-to-back questionable (not saying wrong, but controversial at least) calls.
I think the main complaint about the handball wasn't so much that it hit her hand (it did), but that the exact same thing happened about 15 minutes earlier when the ball hit the hand of a US defender in the penalty box (Megan Rapinoe, in fact) and no call was made. The rules are a bit fuzzy, but generally handballs in the box are called for a PK only if they are a) intentional or b) the hand is clearly away from the body. I think the ref made the right call on Rapinoe's handball, but it definitely could have gone either way on the Canadian one.
Anyway, I agree with you - the better team won.