How old is she?
Young ones shed very fast, once they start, it's only a few hours before they have most of it off.
When they get older, they shed less often, and usually in patches.
Be sure to mist her several times a day to keep the RH high enough to help the shedding process.
Also, if she is 5 or more months old, it's time to think about making a egg laying box.
You can just leave it on the floor of her cage, keep it moist, and she will dig in it when she is ready.