You can file a fee dispute complaint with the state Bar. I saw some info for the Chicago area on the process. The actual process is likely to be similar in all of IL, but where you file may vary by county. Make a call to your local Bar Association and inquire about fee dispute services. You do not have to go into detail about your complaint over the phone.
I would first try to resolve this one informally with her. It looks like we are talking about a couple of billable hours of attorney services, not Fort Knox, in terms of what you might owe here.
The other issue, of course, is whether you have an ongoing need for her services. You may not endear yourself to your attorney if you go straight to the state Bar with this one (which is why I suggest that you try an informal resolution first). You might need to consider a new attorney for any further issues that may arise in your case as a fee complaint probably will not help your relationship with your attorney on an ongoing basis. .
On the other hand, if the case is over, then you may not be concerned about what she thinks.