An intruder

Winter crept in to our home last night. Did I forget to shut a window? Was the front door unlocked? Or did she break in, sliding a thin icy finger through the key hole, turning it this way and that before a tell-tale click let her in? I could hear her wandering about rattling windows and banging doors shut. I was too scared to come out and ask her to leave. Like a squatter she crouches in a corner, trying to be invisible. But the chill in the air and drops of water on the window panes give her away.