Thanks for all the great advice everyone! I went ahead and used the paper towel roll, but she has pretty much avoided it altogether. I'm considering scattering some new dirt over it before giving up and removing it, though. Today she did touch the TOP of it with one pedipalp while holding her lunch. That's as close to it as I've seen her get. In fact, she's been spending a lot of time on the walls of her new home since I added the hide.
I haven't yet added any of the organic soil I got. Now my paranoia involves the high moisture content in the baggie... and how to get rid of it without just leaving the dirt out in the open (for other bugs or ants).