Don't try to put her on a "diet". Just feed her the normal glider portion of fruits, veggies and protein. Cut out all treats and do not give her ANYTHING else but fruits, veggies, and a protein source (eggs, chicken, HPW... No nuts.) This coupled with excerise (wheel and play time outside of the cage) will slowly bring her weight down. You do not want to starve or drastically reduce her amount of food in an attempt to make her lose weight faster, because if she loses weight too quickly it can cause liver failure. Just let it happen slowly. It may take three or four months (maybe longer) but you'll begin to notice a difference. Take some pictures of her now so you'll have a point of reference. Better yet, if you have a way of weighing her, do that and then weigh her once a month to see how she is progressing.