I went to open the window in the basement yesterday and saw that I had a little visitor. The window is in a window well, and there are 2.5' walls on all the sides. At first I thought she was just rooting around, but then realized she was trapped. So, I set a wooden plank down into the alcove to give her a way out. She didn't take it.
I tried to avoid interacting with her because I didn't want to stress her out, so I waited until she was asleep and put some berries from the yard and a little dish of water out for her through the window.
When she still wasn't leaving by the next day, I called a wildlife rescue agency and they advised wrapping the plank in a towel so she'd have some grip, and putting some cat food at top to give her a scent to follow. I did that, and within an hour she was climbing out.
I'm not gonna lie, I'm pretty broken about this. She was adorable, but I'm happy she's gone, running little skunk errands and living her best, if stinky, life.
So kind of you to help her out!