When I was in grade school late 60’s or early 70’s, I used to adore this pink book. It was hard cover and had 4 girl names on it and a drawn picture of dolls. Not illustrated, just a sketch. It had 4 names of the dolls and I think one was like Rosemary. The title only had those 4 names as much as I can recall. Don’t remember the story even. I just remember the hard cover was a bright pink with the 4 names of the dolls.
There are a few possibilities, but they don’t all fit all the details. There’s Rumer Godden’s Four Dolls, but that’s a bindup of four short books, and I don’t think it was pink. There’s The Muffletumps, by Jan Wahl. The third idea would be one of Helen Clare’s “Five Dolls” books.
It could be Merry, Rose and Christmas-Tree June by Doris Orgel, illustrated by Edward Gorey. https://www.librarything.com/work/book/116461950
Could this be The Best Loved Doll? Not four dolls on the cover, but there were four dolls in the book
https://www.barnesandnoble.com/w/best-loved-doll-rebecca-caudill/1100667063