i'd check cupboards, sheds etc. our cat used to hide up the fireplace at the houses we moved to.

also a letter box drop is a great way to get ppl to keep an eye out. we always got a good response and it kind of helped to focus the search area ITMS. (rather than just posters on signs).

we used to also go for walks with DD and the dog and call out her name as we went. (cause sometimes she followed us on walks to the park without us knowing and then would freak and hide in a neighbours yard too scared to come out unless we literally walked past.

hope she turns up soon xx