Was she a Ghost or a Childhood Imaginary Playmate ?

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When I was somewhere between 5 and 8yrs old. I had this friend in the basement that no one else could see. Her name was Isabella and she was in a wheelchair. The problem is I really don't know if she was a ghost or imagination. I can remember distinctly her helping me get my bike around the corner of the basement stairs so I could take it outside. I wasn't big enough to manage it in a tight space so she would pick up the back wheel and put it on the stairs as I maneuvered the front. I would then continue straight up the stairs, through the house and out the door. I also learned math, reading and writing from her. She would correct my papers with a red pencil. I remember once my ball got stuck on top of an old refrigerator in the basement and she let me stand on her wheelchair to reach it. No one in my family even remembers me talking about Isabella. I always thought she was a ghost... but I also remember seeing some movie in the early 60's about a woman in a wheelchair that was run over intentionally by her husband (I think) and then her wheelchair traveled down the hallway by itself toward their apartment. So that is what makes me think it may have been my imagination...however I am not convinced. Is there any way you know of that could help me figure this out? Thanks in advance and Blessed Be, Mari aka Forest Moon