Up until about 2 weeks ago she was fine she is 11 at the moment. She just lies down the whole time but when she did still walk her back legs seem to slide out from underneath her. She doesn't even walk to the litterbox or where she usually eats you have to carry her there. She hardly eats as well, then also up until a day ago she would still look at you when you walked into the room and she would purr when you stroked her but now she doesn't. Obviously first thing that comes to mind is she is kind of old so it might be her time to go but is it ? Or is there just something else wrong ? Is there something we can do for her? Is she in pain?