That's so sad :( Any progress so far?
I would suggest trying to divide the cage up, or place two next to each other--that way they can all see and smell each other for awhile.
Sugar gliders go crazy on any glider that's not 100%. Mine is STILL messing with my glider that was sick. I have a critter nation cage, so I just put the middle grate back in, and covered the hole in it. That way they can both see each other, smell one another, etc. Until my boy is healthy though, they'll have to stay apart.
Maybe try keeping them near each other for a week--giving extra love to your girl. And then slowly try to introduce her to one of the boys. Whoever does best with her, maybe try to put him in the cage with her, and slowly go about things that way (introducing one at a time).
I would say that at least if you could get one to be ok with her, that would be a good start. They would at least be a bonded pair, and that would be some really good progress.