My cat used to have the greatest disposition, but ever since she became pregnant and had a litter of kittens ( 1 kitten) she has been nasty to anyone who visits..especially my grandaughters who she is used to (they have visited every weekend since she was a kitten) This started during her pregnancy and has continued, the kitten has just left for his new home and she went into heat again immediately. Does this have something to do with it. Has anyone had this happen before. Any suggestions would help. She gives no warning and everyone is afraid to go anywhere near her! HELP!!!