Nutcracker themed dolls have been released plenty after the movie’s initial release. For dolls that came out as apart of the movie see here.
Fantasy Tales
In 2004 the Fantasy Tales, or Fairy Tale Collection, line was released which featured simplified versions of the three early Barbie movie princesses, each princess’ horse, and a “Fairy Tale Prince” Ken.
For the Nutcracker, some of the original Nutcracker Kelly dolls were also re-released in Fantasy Tales / Fairy Tale Collection branded boxes.
Vanity giftsets of each of the early three Barbie princesses were also released on belly-button sculpts, with near-replicas of their original dolls’ outfits, minus the gimmicks.
A Tea Party themed release followed in 2004/2005.
You can read further about the Fantasy Tales collection here (to be added).

Mini Kingdom
Barbie Mini Kingdom was a line of smaller 6 and a half inch dolls which began in 2005 featuring the princesses of the animated Barbie movies.

Ballerina Princesses 2008/2009
Clara was released both individually, and also as part of a Toys R Us exclusive two-pack with Princess Genevieve from 12 Dancing Princesses.


20th Anniversary Dolls
For the 20th anniversary of the movie, another line of dolls was released in celebration.






Other Releases
The story of the Nutcracker has had many adaptations, and although these doll are not part of Barbie in the Nutcracker line, they are still Nutcracker themed.