Who made this doll?

This is the doll that originally had the wig that I now gave to the other doll (Shirley). She was described as a ST-look-alike, but, although she is very pretty, I don't think she resembles ST, particularly without the wig.
She is unmarked and has been repainted (maybe there is a mark under the paint, I m not sure).
Any idea who made her?
Thank you!