Final answer:
Marilla finds Anne odd due to her imaginative and unconventional behavior, which contrasts Marilla's practical nature as depicted in 'Anne of Green Gables'.
Step-by-step explanation:
Marilla considers Anne to be odd because of her imaginative and often unconventional behavior. In the context of Lucy Maud Montgomery's Anne of Green Gables, Anne Shirley is an orphan with a vivid imagination, an eagerness to speak her mind, and a penchant for melodrama, which distinguish her starkly from the more reserved and pragmatic Marilla Cuthbert. The narrative expresses Marilla's perspective as she adjusts to Anne's unique personality, finding her behavior to be unusual compared to the norms of her own experience and society. Anne's whimsical expressions and dramatic flair certainly would seem peculiar to someone like Marilla who values order and practicality.