Dumb Question/Advice. My gliders do not like the BLM diet, they prefer the HPW diet, not the premade stuff (that you mix with water)that you can buy online. Its a mix of things and my gliders seem to like it.
I would also suggest offering more protein maybe, if she is losing weight it may be that she needs more protein and fat to help regain weight. I offer my gliders eggs, mealworms and chicken. Not all at the same time! The eggs and chicken need to be cooked with no seasoning or fat/oils. I have spoiled gliders that have their own pot and pan for when I cook for them.
I would also keep an eye out for the ratio's of Calcium to phosphorous, gliders are prone to calcium deficiencies due to their diet and depending on what they're eating they can get it. If possible I would speak to a vet about it, keep a diary/note of all that she is eating and what you are feeding. The vet may have some suggestions or and idea of what to do moving forwards.
I am not a vet, I have no degree or certification when it comes to glider feeding or diets but that is my advice. I hope things turn out well.