Maybe she is here with the body of someone else. Which, if that's the case, at least we know the person we'd be looking for's a woman. And even if her sorceress magic is suppressed, if she were possessing someone else before she came here... it wouldn't be far-fetched to say she'd be trapped here in that person's body.

Taking into consideration that Ultimecia's sorceress magic is focused on time and space, the fact that this place is practically in the middle of a time compression, and that people can arrive here from any point in time... she could be just about anyone here. And neither of us even knows what she looks like in her original form.