The behavior you are describing is often thought to be a sign of stress or boredom.
Is she eating and sleeping as usual?
Try changing or adding some toys and enrichment items for your glider. Even simple things like plastic straws, plastic bracelets (party favors) or monkeys (barrel of monkeys game) on top of the cage for her to pull through and into the cage may give her something interesting and challenging to do.
You can also put her food in several places in the cage so she needs to forage for it.
Has anything else changed in your home that might be causing her stress like the addition of another pet or a change in her cage location? If so, give her some time (a week or so) to adjust to the changes and see if she stops running in circles
If these suggestions do not help, you might consider having her seen by a glider experienced vet to make sure she is healthy.
I am sure other folks will also have some suggestions for you that may help.