Sorry to double post, but I played it safe and took out the wheel. Unfortunately she may be without one for a few days, but it's better than her getting her toes caught, or the whole thing tipping over and hurting her. I'll find a better hut for her to hide in as well. I heard those plastic igloos are good for them, eh?
Thanks again for the helpful replies, everyone. Unfortunately the people at the petshop would rather sell me generic pet equipment than the proper stuff, sigh.