LOL - been there done that, when my dopey British short hair (see avatar) went walk-about for a whole month!!!
He refused to come out for food, and was settled in there very comfortably. In the end, kind neighbour let me in his garden, the other side from where I could see him, and got neighbour to stand by as "catcher" while I poked long-handled broom in from the other side. Tadaaa!
Now he is micro-chipped, got collar with name tag and phone number (my number, not his) and just in case he goes "walkabout" again, a Loc8tor radio tag, which only has a range of 50 yards, but has found him successfully several times now. Once you have her indoors, keep her locked in for a solid month - I know that will be a pain in the a*se, but trust me, it helps her learn where she lives.
PS - if you cannot reach her with a long-handled broom, then try a leaf-blower or (last resort) a CO2 fire extinguisher (honestly)