The one thing I would say is, if it is the rolly wheel that came with the savic, and she is a fully grown syrian, then it is likely to be too small for her. Changing to a jumbo roly, a comfort, or wodent wheel on a stand may make a heck of a difference.
I really like the Rody cage, but this would be my one big gripe with it. Those wheels aren't big enough for any of mine that are older than about 8 weeks!
Mind you - I also have hams that never use wheels too - and I dont worry about it, they always seem to get their exercise one way or another!