Shadow In The Bathroom

I think I've been followed by something for quit a while now, but I don't know what by. It started out with me catching glimpses of shadows out of the corners of my eyes. They seemed to shy away the moment I turned towards them, only giving me a milosecond of a look. This happened for a few months, but I figured I must only be seeing things and it was nothing to be concerned about, but lately whatever this is, has gotten to be more intense than I expected.

Sometimes I see her, standing at the end of a dimly lit hall. It's rare I see her full body, I only dare to look at her legs shaking behind the door if left ajar, her fingers tapping from inside the kitchen sink, sometimes I'll even hear her gently sobbing from another room, but I don't go looking.

I'll most often times see her in the mirror, usually crouched down, almost out of view. I've looked at her by pure accident fully before, she appears to take on the image of myself, but a wispy, dark, shadowy, and seemingly frightened version. If she catches me staring at her, even for a moment, she shakily reaches her hand out to me, her hollow-looking and dimly glowing eyes almost screaming for me to at least stare a little longer, but I never do.