If asked at that moment to choose between "Rrr-rrr-grr-rrrrrrf!" and "No, mine!" Ace would have gone for the one you could say with a human mouth, but that was before she realized how truly nasty a sneaker could taste to a suddenly human mouth.

Also before she realized she was naked.

So, "No, mine!" it was. (Slightly muffled by shoe.) Followed by "....Flippin' HELL!" (Significantly less muffled by shoe.)