Tia is in our prayers! I hope she is alright! My mom's maltese did the same thing a few months ago. When we took her to the vet they did all the "tests" for broken bones or dislocations and just gave her a shot. She turned out to just have a muscle spasm from the initial shock and the shot helped her relax...hopefully that is what is wrong with Tia and she gets better...
Keep us posted