I've never played a BH far enough to romance her (I keep meaning to, I really want to unlock Chiss), so I can't really say with much certainty, but I always thought she was meant to be more mousey than loli.
Indeed. I did say she looks
like a little girl, but that doesn't necessarily reflect her actual age (since, as I also mentioned, she is at least intellectually mature). I know quite a few people whose ages I've been mistaken about because they look significantly younger or older than they really were... or maybe that's just a sign of my own old age