Is she chipped? Then you can call the local vets and shelters. May be someone in your neighbourhood mistook her for a kitten and brought her there. You can call up and ask with a good description of your cat anyway.
A local FaceBook group might help as well. Make sure that you post on your page publicly a picture of your cat. Then share it in the local group. So everybody there can share it as well. Otherwise it would be technically not possible.
Best tip: Get yourself a powerfull torch and go out in the night. Call her and listen carefully. When she is in reach you´ll hear her. Nights are a lot quiter than the days, less people and cars. This will help immensly. That´s the way i found my cat once just 30m from my home in the basement of an appartment building.
Another time i put up A5 papers with her picture, a description and my phone number at various lamp posts in my area as well as in shops, the local pub and whatever. After eight days i got a phone call from the driving school nearly opposite of my flat. And there she was hiding in the basement, the rascal.
Please don´t forget to collect these papers after a while or when you have been sucessful. Not just out of pleasentry but then people know that they don´t have to look any further. And the place is free for the next one. Cat owners are always active and looking for missing cats. I got at least 10 wrong calls of sightings before the right one came in. So just don´t give up.
Over here in Germany there is a private non profit organisation called „Tasso“. There every owner can get his/her pet registered for free inclusive chip number, description, address and picture of the pet. This will be like a fact sheet or „Wanted“ poster. One can save all that on their server and store it on ones own computer as well. In case of a missing you can print it out quite fast and put it up all over the place.
Registered animals can be found very fast because as they are activly checking the chips number with all vets and shelters in your area. Which you can do yourself on their site anyway for free. Very good idea and perfectly executed. Don´t think that there is something like that in operation in Ireland.
But you can always get a fact sheet together for immidiate print out for yourself anyway.
Good luck and a thumps up.