I think this one's from the 90s, but I can't really remember much about it. There was a girl who finds a dollhouse in the attic. I haven't got much more than that, except something weird happens relating to the dolls in the house or something. I know it's not much to go off, but maybe something?

There is a TV Movie and Book called The Dollhouse Murders, is it that one? She finds the dollhouse in her aunt's attic, it is some kind of family secret.

That sounds right.