The other side of McQuage?
Sounds like kitty may have been picked up by a hawk or owl or something and got away. That's one of the only ways a cat will cross water (I doubt she took the bridge ;-)). We are leaning toward that being what happened to Angel, as we heard a BIG owl the other night. I did not realize that owls and other big birds were carnivores until my spouse, who was raised in a farm family, shared that with me after hearing the owl.
Strangely, I have also noticed that we are not seeing squirrels in the yard and running up and down the trees. I know it's hot, and I don't know if they just hide out when it's hot, but I'm concerning that the squirrels are being picked off now too.