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.
The Wednesday Witch by Ruth Chew? If so, check out her other early witch books too! (The later ones are not so fun, IMO.) She also wrote at least one non-fantasy novel – Baked Beans for Breakfast, aka The Secret Summer.
Perhaps “The Wednesday Witch” by Ruth Chew?
My first thought was The Wednesday Witch by Ruth Chew. http://ruthchew.com/about-the-books/The-Wednesday-Witch.htm Some of the details are a little different, though, so perhaps not.
I agree with The Wednesday Witch. As for the other details, I would hazard a guess that you’re thinking of Sal in Magic Elizabeth, who was staying at her Aunt Sarah’s old house.