I'm sure she'll love it! Some changes stress them, but if it's something they prefer they often take to it well! I can see your point though - if she has a much loved favourite place and it goes, she might be quite upset, even if the new wheel is good. On the other hand if you leave both in, she might still get upset when the old one gets taken out, so probably best to do as Velma says and just swap it. Then the new experience will distract her from losing the old wheel.
And pop a couple of treats inside the new wheel
