Yes... at just 9 weeks old I would say that she is biting more out of not knowing you yet - so be patient and the biting will decrease and then stop over all when you and your glider are more bonded to each other.... and please know that this process could take some time before she will be fully bonded / trust in you - it took one of my twins three months to bond with me and still she still nips my fingers from time to time.
What I would suggest right now is that you not place your hand in her pouch to take her out... but rather take the pouch out of the cage and lay it on your lap and let your little girl come to you... now you can try giving your glider a treat at the time so she will associate this moment with happiness.
I would also suggest that you slowly place your fist into her pouch (slowly) when you have her out and just let your glider snuggle up to the warmth of your hand and sleep.... I use to do this for a few hours a day while I watched tv at night and it worked wonders.
Tent Time.... this is when you have a pop up tent in which you and you gliders go into the tent together and have some fun together. When you first start having tent time together I would recommend that you not take any toys into the tent so your glider will have to use you (your body) as its toys.... this will do wonder for bonding. After a week or two has past with you bonding in the tent with your glider you can add safe supervised toys / roped in the tent for your glider to play on..... and don't forget the camera it is a must for tent time.
Here is the TENT I have..... it is easy to put up and take down.
* * * * * * *
A big "NO" on the leash ideal as it can damage the membranes on the side of your glider, therefore, taking your gliders natural ability to glide away from them forever.
And as far as hamsters ball go.... I personally do like them as a glider is larger and more active than a hamster is and could get hurt in the hamster ball... not to mention the sanitary factor of it as gliders will pee and poo in the ball as they run getting their waste all over them.