Marilyn Arnold is one of the BSC clients. Her twin sister is Carolyn Arnold.
- allergies:pumpkin seeds
- school subject bad at: gym
- after school activities: music club meetings
- #21 Mallory and the Trouble with Twins
- #30 Mary Anne and the Great Romance
- #60 Mary Anne's Makeover
- #97 Claudia and the World's Cutest Baby
- Mallory and the Pet Disaster
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