[trex1310]

Buy a couple of rubber door stops. Put the stops at the front
and back doors. When your wife goes to the door teach her
to put the door stop about 8" from the door. No amount of
pushing will dislodge the stop. This isn't foolproof, but better
than a chain and will buy precious time. If an intruder reaches
in to try and dislodge the stop, a baseball bat to the elbow
will do wonders to discourage it.