Totally agree with Jan. do get her to the Vet to get checked. I would not suggest moving her around or trying to manipulate anything. Let stay quiet. If she seems in pain or too lethargic, get her to a Vet ASAP
PLEASE TAKE HER TO YOUR VET AS SOON AS
POSSIBLE...this will ease your mind and you will
know if she is alright so you do not have to worry.
From what you are saying YES she might have been
injured, snapping and whimpering when her back legs
are touched "firmly" could be a sign she had been hurt
and she needs more help than you can get on a on line
No one here can TREAT HER OR HELP HER,PLEASE
TAKE HER TO YOUR VET.
I wish there was some way someone here could help
but she needs to be examined and checked,something
no one here is able to do.
Please come back and let us know how your little girl