Steffi is a Barbie clone, and Evi is the little girl Kelly/Chelsea clone. Several styles of ponies have been introduced over the years.
This body is reminiscent of one of the Remco molds. There are no brand markings on this one.
This body is similar to the above with different eyes, minus the swirly design on the hooves, and the bent hoof is on the opposite side. It is marked Simba on the belly.
(no tinsel vs. tinsel)
Little Fairy & Pony:
Unicorn Mom & Baby (came with Steffi fairy doll):