We actually have a Squeaky in our neighborhood, and for the exact same reason -- she seems to have lost her voice, and squeaks on those few occasions that she has something to say. But she's a huntress that kills, so has no need to communicate most of the time. (PS I love that cat. I'd take her in, but (a) she already has an owner, and ( I'd be afraid for my other kitties.)
Rorschach? Sounds like a male name, so not that serious a suggestion, but her colorings remind me of a Rorschach test (and therefore of Rorschach's mask). Vicki? (Meant with all respect, of course.)