Try offering a couple types of vegetables and no fruit for a few days and see if she will try them. Gliders will not starve themselves and will learn to eat the food offered.
You might also consider switching to one of the widely used glider feeding plans that has a recipe for a nectar like staple to provide the protein, vitamins and calcium gliders need daily. I have links on my web page to help you locate the information on these diets.
http://www.gliderkids-diet.com/Staple-Recipes.html
My own GliderKids Feeding plan is one of several options. There are links to other feeding plans in the left column.
She may be eating the fruits because they are usually more juicy than vegetables. Gliders do not drink much water and depend on the juicy fruits and vegetables and a nectar like staple that most feeding plans include to meet most of their fluid needs.
She may need more liquids (by eating fruit) because she is also eating the dry pellet food.
Pellets are not the best way to meet your glider's nutritional needs long term.