One of my foster-cats, Patti, has started a new evening ritual: I live in an apartment building, on the first floor; when I come in she darts out of my apartment into the hallway and walks the length of the wall to the front door. She sits there and just meows and meows in a sad way. I pet her, play with her, until someone else is in the hallway and she gets scared and runs inside my apartment. This can go on anywhere from 5-15 minutes; if I am not tolerant, I just pick her up and carry her inside. Keep in mind she is ten years old and has never been an outdoor cat, no exposure to the outdoors, except looking out windows. She seems happy otherwise - should I just humor her? What concerns me is the meowing - she is a quiet cat, very well behaved, and it just sounds unhappy. Or is it something to worry about? (Note: although she is a foster cat, she has lived with me since last November)