We took on two rescue kittens (now 6 months old) about 7 weeks ago - they are absolutely lovely. They were both neutered/speyed about 10 days ago and are doing fine. We have been letting them go outside whilst we were at home for about the last 5 days. They have been going for a potter and then coming in within the hour. Tonight we popped out for a drink and let them go outside when we went as they were both crying at the door. We were gone about an hour and when we came home the little boy kitten came to greet us. But his lovely sister is nowhere to be seen. She's been gone about 4 hours now which is unheard of for her as she's a timid little girl.
We've called and called her but she hasnt come back. Am now worrying about foxes as she is quite small despite her age 
and we live in woodland.
Can anyone cheer me up and tell me she will come home? Our last three cats all lived to be very elderly so its been many years since we have had to fret over a kitten. I'd forgotten how worrying it is when they go awol....