Whenever she followed us indoors in one of our room and when we closed the door, she will meow non stop. Even if we did not close the door, she will meow too. I am not sure what's wrong with this cat, we did not lock her up at all. She is free to go wherever she wants. She's a stray which is residing below our office, we do let her in occasionally. Sometimes she will voluntarily walk upstairs herself and sleep/lie outside our door on the carpet. Her most quiet moments is when she's looking at the door, observing (thank god). Now as i type, she is inside our office (closed doors), she did meow a bit but stopped. I don't know if it's the timing or not but around this time she won't meow as much as other timing (lol). She's a timid cat but we aren't scaring her, we just would like to keep her indoors. Question is why is she always so stress? Solutions??