Some of her most popular books include:
- "The Polly and Oliver Adventures" (1921)
- "Polly and Oliver's Trip to America" (1922)
- "Polly and Oliver's Circus" (1923)
- "Polly and Oliver at the Seaside" (1924)
- "Polly and Oliver's Christmas" (1925)
- "Polly and Oliver's Farm" (1926)
- "Polly and Oliver in Toyland" (1927)
- "Polly and Oliver's Pets" (1928)
- "Polly and Oliver's Secret" (1929)
- "Polly and Oliver's Treasure Hunt" (1930)
Weir also wrote a number of other children's books, including:
- "The Magic Umbrella" (1920)
- "The Three Little Pigs" (1921)
- "Puss in Boots" (1922)
- "Red Riding Hood" (1923)
- "Cinderella" (1924)
- "The Sleeping Beauty" (1925)
- "Snow White and the Seven Dwarfs" (1926)
- "The Wizard of Oz" (1927)
- "Alice in Wonderland" (1928)
- "Through the Looking-Glass" (1929)
In addition to her books, Weir also illustrated a number of children's magazines and books by other authors. She was a prolific and talented artist, and her work continues to be enjoyed by children around the world.