Betsy's Little Star by Carolyn Haywood was first published in 1950.
One of my favorites of the entire series, it was difficult to find a "vintage" cover of the book I remember. Betsy's Little Star has been out of print for many years, but the newer paperback books are still readily available.
This story features Betsy's little sister - Star - who at four years old is too young to go to school. Illustrated with black and white drawings by the author, Star has to deal with her emotions of being much younger than Betsy. But soon Star will turn five years old and will be heading off to kindergarten.
I am a married mother of 3 grown daughters and I have 2 granddaughters and 1 grandson. I currently have a gardening column in the Sunday's Advocate Messenger and I freelance for Kentucky Monthly magazine and Examiner.com.