Ghost?

One night you were crying in the bathroom and your mom came in and calmed you down you look out the window at 12 in the morning and you saw your 7 year old sis walking down the road you yelled "MOM MOM LOOK OUTSIDE" you were about to run outside but your mom stopped you and said "it's a clone if you come outside you won't come back just go to bed.." you asked what will happen when you come outside and she said "I don't know"