No, it's my fault!
As two-year-olds are wont to do, A likes to claim everything on the planet as her own. The dogs are hers, the house, the television, etc. She can't stand the thought that someone else might have ownership of something, even a bad something. Apparently she overheard me saying "Oh, that's my fault" to my other half. Or at least I assume she heard it from me - God knows he's never been at fault for anything.
Now she screams "No, it's MY fault! It's mine!" at us.
It's tres adorable, ne c'est pas?