My kitten KK who has a fully amputate tail was just playing with her mouse and all of a sudden she stopped, began limping like she had her leg caught on something. She became frustrated let out a meow, sat down, for less that a minute and now is fine, playing again. She just had a check up last week with no problems. She did have a very bad tail injury when I found her as a stray and the whole thing to the base of the spine had to be removed. Any ideas what just happened? She's never done this before.