Don't Know How To Describe This One

I was sitting on our love seat playing on the computer when I seen what I thought was my oldest daughter coming downstairs and going to the kitchen area for something. I heard her singing and thought it was taking her awhile in the kitchen to do whatever it was that she was doing. I went out to look and there was no one there. She had short red hair, which my daughter hasn't had for quite sometime,wearing a short sleeved white tshirt with flower designs on the front and blue jeans. I went upstairs to ask my daughter if she was just downstairs and she stated "no". I told her what I saw and then walked away and then I went back to her room to talk to her more because I realized that she no longer has short hair and wasn't wearing anything remotely close to the clothes on this thing I seen. The scary thought of it is that I actually thought it was her even though I should have known better that it wasn't,mainly because of the hair length, not counting this thing being a very solid form, like a real person. I did not see the face because she was looking down at the floor as she was walking, but I seen pretty much everything else. Also a note, not sure why, but the animals had no reaction to it, maybe because they were all sleeping when it happened. Still trying to fathom my thought process during and after this happening, which I think is not right whatsoever.