I wouldn't let her out at all. I'm sure she can feel vibrations....like floor stomping. Learn to use vibrations instead of vocals.
I nearly ran over a semi feral deaf cat with a mower once....she couldn't even feel it coming, OR was so terrifed she didn't know which way to run. She stayed around for food for a few weeks, then disappeared. NO idea if she 'went onward' or a coyote/owl, etc got her.