She's doing the 14-hour depression naps, huh? Poor girl.
Why not "An unhappy girl sleeps"?
It should be correct as Latin doesn't have articles, so as long as it makes sense, either "A/An or The" should be allowed.
My answer was "a wretched girl sleeps" and it was accepted, but I got the message "you have a typo". Suggested solution: "AN wretched girl sleeps"