I think I may have posted this the last time that Zazou got lost but years ago my blackie Boo darted out the door after a feral cat and it was the coldest day of the year. I thought he'd be easy to spot against the white snow. Not. My son and I searched for him for hours and finally gave up when it got dark. He was gone all night and I left the garage door up just a crack and he came into the garage after midnight and meowed inside the garage. Of course, I bolted out there and hugged him so hard! He was filthy, all muddy, but I just brushed him and he slept w/me that night. The next day I put a sign on the wall near the door at cat level "You are a guest in this house. If you leave, I won't count on you coming back." I meant it as a joke for humans to get a chuckle out of, of course, but I swear Boo read it and he hasn't tried to bolt since. Before that time, he was always trying to make an exit. Now he's 16 and settled in and has no desire whatsoever to go out but he does still get his hackles up at outdoor cats who come around. So take heart, Zazou may come back and decide she's had enough and, if not, whip up a sign. She may get the message on a subconscious level and it just might do the trick.