Shock from the impact, no doubt. Hopefully not internal damage. They have remarkable healing properties and I know you are making her feel as safe and comfortable as she can be.
We had a full grown RSL hen pulled through an iron grate on the floor of the coop by a hawk that was under the raised floor. He pulled her through a 1 1/2" wide gap between iron bars. She suffered only scuffs and scrapes and mild punctures externally but had to be extremely bruised from being pulled through. She was in shock for about 3 days, then "woke up" and was fine, just stiff.
Edited by WalnutHill - 3/21/16 at 7:15pm