The good news: Anya caught her first mouse ever.
The bad news: It was in my bedroom.
More good: Anya is fed well enough that she did not feel the need to eat any part of the mouse (which gets gross, let me tell you).
I'm increasingly grateful for my childhood pet experiences, as I actually bred and raised hordes of mice (well over 100, maybe over 200--they had big litters of 8-13 mice each time, so they multiplied pretty quickly, and we had fun raising the cute tiny baby mice). Thus I don't freak out when I see a dead rodent, and I'm not too worried, because I haven't seen any other signs of mice around my house. Granted, I haven't been looking, but usually when I'm in a place with mice (I haven't been in many, but I have been in some, mostly cabins) I can hear them scurrying around at night and I see their droppings and things they've chewed, but I've experienced none of that so far, so maybe this was just a stray little girl who came in from the cold. Poor thing.
Besides that, my downstairs neighbors have 2 or 3 cats, and I have Anya, so if there are more mice, they'll hopefully get caught (but I'm still telling my landlord, don't worry).