Our glider will groom a lot in the pouch.
If I put sophie in my shirt, she will groom with quick scratching movements for about 10 to 20 minutes, then usually go to sleep.
I have seen some of our gliders moving around like dreaming in their sleep, similar to the dogs.
3 weeks is a short time, just keep up bonding pouch, scented fleece pieces in pouch with fresh scent every few days and run around time in tent or bathroom is something I like and think really helps the gliders some.
but I would think most gliders take more then 3 weeks. Keep nicely pushing her to bond with you, just don't get overly handsie, and try to pick her up all the time, I dont think that helps much.