"Then why exactly did you stop me?" she asked, stalking closer, teetering on the edge of cross. Amy Pond was no fragile flower to be told what she wanted she couldn't have and drift away sadly. No, if you were going to point out that which was both painful and obvious, you were going to have to explain why.

This is the woman who once threatened someone with the equivalent of an electric tooth brush, and meant every word of it. And she meant now to have answers. Because that's what she learned with the Doctor. When someone borderline creepy looking starts being vague and or menacing at you, poke at the reason with a stick until you find out what's really going on.