Here is a doll I found at a doll show and just loved the pink hair. After some research I determined that she is a Horseman doll called Couturier's Renee Ballerina. She has an interesting poseable, stuffed vinyl body with wire joints in the legs and ball joints at the elbows. She has rooted pink hair in the original ponytail style and wears the original white ballet dress with tights and slippers. She is 19" tall and was made in 1957 and 1958 by Horseman
This is a ballerina doll marked EEgee on the back of her head. She is from 1958 with rooted pink hair and is 17" tall. She is wearing a modern dress made for the Madam Alexander Coco doll.
Here she is in a ballet tutu I made for her from a vintage pattern to try to replicate what she probably originally wore.