This was an old book that I read around 1987-88. I remember it being beautifully descriptive, concerning the dolls, which came to life and spoke to one another when the girl was away, and their house and dresses. I think I remember the descriptions depicting debutante style dress, with parasols and the like. There may have been conflict regarding a less auspicious doll joining the house. This story does not match up with anything I have yet looked up, though The Best-Loved Doll did come close to ringing a bell.
Have you ruled out The Dolls’ House by Rumer Godden?
Rumer Godden wrote several books where dolls, often in dollhouses, had lives of their own. I suggest a Google search “rumer godden doll books” and then checking Goodreads to see whether any of the synopses trigger your memory.
I would investigate the Five Dolls series by Helen Clare, if you haven’t already.
I also thought first of Rumer Godden’s ‘The Dolls House’. Another possibility might be Frances Hodgson Burnett’s ‘Racketty Packetty House’ https://www.gutenberg.org/files/8574/8574-h/8574-h.htm
Have you looked at When the Dolls Woke
by Marjorie Filley Stover?
If you’re still stymied, consider Racketty Packetty House by Frances Hodgson Burnett.