First off welcome, and I'm so glad you found this site. And your glider is precious, the halloween pic is too cute!
Pellets for the most part are crap, Sugar glider info . org is crap (run by a mill breeder who just looks for profit, not for the animal
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This site is AMAZING- research on here to find your little one a good diet. HPW, BML, Suggie soup are all great, and there are more! Pellets are hard, gliders are naturally sap suckers. Its no wonder gliders don't like pellets in comparison to their natural diet!
Rule of thumb for diet is 50% protein, 25% fruit, 25% veggies.
Tonight, boil up some chicken (no seasoning) and give it to her, I'd put money on it she'll gobble it right up! It will be like eating real food after eating potato chips for months.
She also needs a friend, someone to cuddle with, play with, and talk to in her own language. Gliders shouldn't be alone, it can make them sick. She'll become a completely different glider once she has a friend! Its incredible! I speak from experience.
Ask as many questions as you need! We realize its a lot of information all the sudden, but I promise everyone here as only the best intentions.