So what’s the vocal range of a Hawlucha like? Because my little lady hawlucha seems to only use high pitched, keening noises, and I’m not too sure whether I should be alarmed.

Actually, that’s what most female hawlucha—and, indeed, quite a lot of male hawlucha—sound like. The deeper-voiced hawlucha have deliberately trained themselves to vocalize at lower pitches to sound more intimidating.

So your hawlucha should be just fine!