Nancy Didion is the illustrator of the following:
- The Baby-Sitters Club Guide to Babysitting
- Trivia & Puzzle Fun Book
- 1991 BSC calendar and 1992 BSC calendar stickers
- The Kids in Ms. Colman's Class #1 Teacher's Pet stickers
- The Baby-Sitters Club Secret Santa page 17 (front of card showing Christmas tree and presents)
- Super Special #12 Here Come the Bridesmaids! tear-out postcard (same illustration as card found in Secret Santa)
- The Baby-Sitters Club Chain Letter page 13 (front of card showing a mermaid in the sea)