This is a book that was in the library when I was in grade school so early 90’s. It was already vintage then, probably 70’s-80’s, but I actually have no idea as to the publishing date. It is about a young girl who acquires/has a dollhouse with a little witch living inside who is alive and rides around on her broom. If I remember correctly the house is in the room where she is staying with an old relative. I think someone’s name started with an S, possibly Samantha, but I could be mistaken.