PS ... I have also bought a small "locator", like a tiny remote I can attach to her collar. The other remote is synched with it and at the press of a button, I can locate her when the locator on her collar beeps in response.
I have not put this on her collar yet, I am try to think of a way to attach it so it can't dangle down and get dipped into the water bowl and/or accidentally activate the beeper on her locator if she wrestles with the other kitties.
Ooooh.. where did you get it? How much $?