how old is she?, and how long have you had her?
Is she by herself or does she have a cage mate?
Are you using a bonding bag during the day?
Does she have a glider safe wheel and toys in her cage?
Pouch protectiveness is usually fear based. Open environment pouches can help considerably with pouch/cage protectiveness. These types of pouches helps them SEE what is happening, coming at them, where noises are coming from etc...
Using a bonding bag for a couple hours during the day can help with bonding. If she is pouch protective in the bonding pouch you can try leaving the top open, even rolling it down half way so she can see better. This helped my male a whole bunch!!
You can also sleep with a piece of fleece for a few nights and put the fleece in her sleeping pouch so she can get used to your scent when not in the bonding bag.
When you are interacting with her try to be calm and confident. They can sense when you are scared, unsure, and intimidated by them, which is what they are shooting for when they lunge at you.
Lunging is one of their few tactics they use to intimidate predators, which at the moment is what she thinks you are. Bonding is simply establishing trust. Showing her she can trust you, and you learning to trust her.
If she is a single glider, she would benefit greatly from having a cage mate. Cage mates can help with bonding, and building her confidence up. They learn quite a bit from each other, not to mention no matter how much time you can devote to them humans can not replace another of their own kind.