Gliders can get fleas. Please call your vet, don't try to treat them yourself.
As for the veggies, have you tried giving them to her raw? Get some Spring Mix, mixed baby greens in a bag. My boys love them, they get Spring Mix at least every other day and eat 'em all up. They also like raw carrots (thin slices), cucumber, celery, radishes, bell pepper, broccoli (leaves and stems, but not the florets, goofies!), green beans, cabbage, tomatoes.