sounds like a probable spine graze of some sort.....dont know if they can shake that off or not.....swelling and such may leave it paralyzed soon......just my thinking.....dont know for sure......depends where and what you hit....but collapsing at the shot and laying there kicking sounds like a spine hit/graze/bullet shocked the spine or something to that extent.....dont want to worry you or anything.....stuff happens.....keep looking..she may be hit pretty good.....and you may have a chance to find her since you dont know where you hit......stick with it.......good luck.....keep us posted....i dont know much about tracking deer or diffrent hits or anything.....so im not an expert at all.....just what i think from what ive read here and there along the way........good luck