Emily,

Any way the management can help you get the kitten out? What I worry about is the hot water pipe she may be next to. I'd hate to see her get hurt. Plus, are you SURE the cat is in there and didn't find another safe haven???

Try a 20 gal. Rubbermaid bin with lid and flip it over and cut a hole in it so she can get in and out. Line it with newspaper, straw and an old blanket. Keep food and water out for her as well. Stick a little salt in the water so the water doesn't freeze if the temperature drops.

Good luck and keep us posted.