This sounds just like Jameson, and I know what you're going through. It's hard not to worry, but at least your neighbours have seen her. Let her come back in her own time - she knows you're back, I'm sure she is sitting somewhere hiding while you're calling her!
Jameson does this, I'll be out calling him in my morning robe, walking around the garden like a droid, with einstein hair, waking the neighbours up - no pud to be seen. When I go indoors and close the door, within seconds there is a kitty at the flap! Little butter.
I hope she comes in soon though - but I wouldn't worry - she is around, and alive!!