Just watch her closely for a few hours, this happened with my puppy. I dropped her and a few hours later she had a seizure but thats worse case scenario. Hopefully it's nothing serious, if you see her sleeping a lot or in constant pain i would take her to get a physical just in case.
Hopefully at that age her bones are still somewhat soft, watch for swelling as well if he/she licks at the air when you touch or pet her on or near the area. That's signs of pain. I know a squirrel is different from a puppy but I once had a squirrel I watched fall from a two story building he landed flat on his stomach I thought for sure he was dead but I rushed over to him noticed after a minute he was breathing so I took him home and he was fine the next day just in shock mostly. And once he learned he could fly well he's was a nut! But hopefully your pup is ok take him to get checked if anything is off! If you love your dogs like I love mine (like my kid!) Then I'm sure you'll do right by him! Good luck hope all is well!