How far did she fall?
Can she walk and move?
Does she look like she is in pain when she is awake?
Can she eat and drink and go the bathroom?
It does not sound like she has a broken neck or a broken back. If she did, I don't think she would be able to walk. Just like when people break their necks or backs. There would be spinal cord injury as well.
She might just be very sore.
She could also have broken bones that are not as obvious like broken ribs.
If she is falling over I am wondering if she has a broken leg? Or, does she have some sort of internal injury. She could be bleeding internally and that could make her very weak.
Look at the color of her gums. What color are they?
You are fast!
Is that her normal shade of pink?
Is she limping like she may have a broken leg?
I am trying to figure out why she is falling over.
Does she fall over right after she stands up?
Or, does she walk normally then start to sway?
She may have fractured part of her pelvis.
Lets not let her walk around anymore. Keep her confined to a small bathroom, crate, or kennel. So she does not do more damage. In case there is a fracture.
Is she a big girl? Can you carry her out to go potty?
Ok. She is so young that she had no depth perception. That is why she fell off. I had one do the exact same thing off my 10 foot deck at 8 weeks of age. My mom was suppose to be watching her. She was fine. The dog is grown up and is sitting right next to me now.
Anyway, buy some karo syrup, pedilyte, and some chicken baby food. If she is not eating her puppy food (or formula) put a few drops of karosyrup on her tongue every few hours to keep her sugar up. You can offer her some chicken baby food too. A few drops of pedilyte on her tongue every few hours too.
You could take her in to the emergency clinic tonight for xrays. If she starts acting different I would take her in.
Otherwise take her to the vet tomorrow for an exam and xrays.