It might just be that she's too young to be interested. 9 weeks is a pretty little puppy. Even if you can
get her to walk, she shouldn't be doing much on-leash walking at this point, anyway. Repetitive exercise like enforced walks on pavement can be very hard on young joints. It's actually better to have some unstructured, run-around-the-grass play at this age.
Does she play in the yard off leash? Does she like toys? If she goes gaga over balls or frisbees, you might be able to get her to move by tossing a ball in front of her (softly, so she doesn't go tearing off, dragging you behind her!
)--teach her to 'give' and work her into picking up the ball then bringing it to you. If you have patience, you might eventually get her to follow the ball down the sidewalk, she comes back to you and you roll it again for her to follow...ad infinitum.
Is she active otherwise? Is it possible she's having joint problems that might make her uncomfortable walking?