Have I done enough? Will my Cat come home - missing 5 weeks?

My female spayed cat who is nearly 4 years old has lived with me (and her two litter mates) since she was 8 weeks old. My cats have always had the freedom to come and go as they please (cat flap). My house back onto a small wood in the UK (badgers, birds, mice, rats etc). I've heard it's unlikely that a badger or fox will take a cat and I have looked for evidence of blood, fur, her collar etc and seen nothing. I spent 5 days searching the wood, cutting back stinging nettles etc, looking up trees and calling. I made 500 posters/flyers and put them up around the area and through people's letter boxes. I spent �100 in adverts in the paper with her photo in (she's been in 13 nights). Put her on lost & found websites. Knocked on doors in my road and the following road for people to check sheds etc. I have had about 15 phone calls and viewed 6 cats that weren't my cat but now after 5 weeks my campaign is dwindling. I was exhausted and people are telling me to move on with my life. Should I end my campaign or carry on? Has anyone got any nice stories about cats coming back? There are a lot of cats in my road and thankfully no others gone missing so I don't think there's anything really horrible going on. She is a lovely placid cat but weary of strangers and quite independent at times - would rarely seek out fuss but loved it when you fussed her. What do you think happened to my baby? Oh and I've checked with the local council who keep a record of RTA's - and scan for a microchip (which she is) so at least that is good.