My Mum saw a ghost of me yesterday at my boyfriend's house, although I am alive, what is this? Help please...?

She saw me, wearing the clothes I was wearing that day on his front porch by myself, she said "hey, there's Emily" then I literally dissapeared. But at this time, I was in my boyfriend's room the entire room. Why did she did a ghost of me if I am alive? Help please.
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