Trying to remember a book about a dollhouse?

It would have been published before 1994. It was about a girl who was sent off to live with relatives. She finds a dollhouse hidden away in their old house and the dolls in the house come alive. There isn't much else I can remember. I think she was sent away because someone in her home had whooping cough - or some other contagious disease and they had to quarantined. It wasn't the dollhouse murders. If anyone thinks they know, please let me know, I'd love to find this book for my daughter.