Yesterday when I got home from work I let the kittens out to play. They played for a while, then came in and ate, then went back out and played, and then The Runt came back in, but no Little Girl. After a while I went out to check on her. I could hear her meowing, but I couldn't see her.
As it turns out, the reason that I couldn't see her is because she was about sixty feet up a neighbor's pine tree.
I went to the base of the tree and called to her, and she would meow piteously, but she wouldn't budge. The tree is huge and it has a ton of closely-spaced branches, so I knew she could get down if she tried.
I kept going out to the tree, and calling, and she'd meow, but she wouldn't come down. It was awful - she was meowing so loud I could hear her from inside the apartment, but still she wouldn't move.
Finally, after a couple of hours and after it had been dark out for a while, she showed up at my door, covered with pine sap but none the worse for wear.
At least now I know she can get down. But I swear these cats are gonna give me heart failure.