have you called the shelters in your area to let them know? in case she gets turned in? if someone finds her they may take her directly to a shelter thinking that she is someone's pet & they might be looking for her...

cat's have a tendency to lose collars & tags...they become tangles on things as they wander about...it's why i always used break-a-way collars on my one who went outside..so it wasn't a choking or trap hazard. you can get her micro chipped so that if she gets out again & is turned into a shelter they will scan her & it will register as your pet. all vets & shelters usually have these.

does each building have a central lobby..maybe put a poster in each lobby

good luck. cats are very resourceful.

stumpy