My suggestion would be to start as soon as possible, but take it slow so you don't cause a lot of stress on the mother. Don't push her a lot, but just keep trying and do a little more each day. Pay attention and you'll be able to tell when she's getting anxious. You may have to start with just a few minutes at a time.
I have twin joeys 7 weeks out of pouch (oop) and wasn't bonded to their mom because they were already in pouch when I got her. I didn't want to push her before they came oop. I've found many good bonding ideas on a lot of different sights. Some ideas that helped me so far are:
Sitting outside her cage when she's out eating and playing, give her a treat through the cage bars. Talk to her and get her comfortable with you being there. Read a book or watch videos or listen to music (quietly) if you do that. My girl likes Frank Sinatra!
The next thing I did was reach in the cage to give her a treat, but don't chase her down with it. Just get it close so she can take it without biting you. I wanted her to be comfortable being close to my arm and hand.
The stage I'm working on now is to take the whole pouch with all of them out of the cage and hold them. Once they know it's me they calm down some, then I give her a couple of treats. We've come a long way, most of the time she lets me pick them up out of the pouch and hold them for a few minutes. "Suz' Sugar Gliders" website has information about how much and how long to hold them. I want to get her comfortable with my hands and holding her next, but we haven't worked on that yet. Maybe next week!
Hope this helps and you can have fun with them like I have! Keep us updated if you can