I had bought a female glider named Luna. I kinda felt like the breeder took her from her mommy too quick because she seemed to be extra scared and very aggressive. It took me a very long time to be able to give her a treat without her lunging at it.( she would even crab while eating and almost choke) I think the thing that helped us the most was tent time. When we sat in the tent and after a few times of seeing I wasn't going to eat her,she actually came around. When she finally became friends with Jupiter(she was bought to be a cagemate but was too scared of everything) I think it helped for her to learn from watching Jupiter and I.
So,between tent time, another glider to teach her, and lots of treats, Luna the lunatic became Luna loo. Don't give up :)