I have the same doll in my collection(the larger one in the picture)~ The doll was dressed up and used at a bridal shower for my grandmother before she was married.
That larger doll in the middle is up to something. Better watch her!
I think it looks like she just smacked the little fat doll in the back of the head.
I kept being drawn to a doll on ebay because her face seemed familiar somehow but I just couldn't remember where I'd seen it. Then I remembered it was here...of course.(http://www.ebay.ca/itm/Sweet-Vintage-LITTLE-GIRL-ALL-BISQUE-DOLL-w-BOBBED-BLONDE-HAIR-BIG-BLUE-EYES-/230689104040?pt=LH_DefaultDomain_0&hash=item35b62460a8)
Thanks: dolly and I are flattered to be so remembered! Did you end up buying her sister on ebay?