Try getting down as close to the floor as you can and slowly move your hands towards her and scoop her up. This may help you when it comes to catching her.
When I first got Bell from my brother, she was scared of me. If I went to go pick her up she would run. I figured out that she was scared of my size and a big handing coming out from the sky to grab her.
That's why I decided to get on her level and scoop her not grab her. I've noticed grabbing freaks gliders out. I think it's because that's what predators do.
I don't put Finn in a bonding pouch because he always chews it and I'm afraid he'll destroy it.
I rescued a sugar glider that was known to rip out the stitching, causing a hole, and escape from it. He hasn't done it in the time I've had him.