Mary is introduced as an ugly, ill-tempered, and demanding girl due to being neglected by her parents who blamed her sickliness. After being orphaned, she moves to her uncle's estate in England where she starts to mature, making friends with others and taking an interest in gardening. She works hard to restore the neglected secret garden, demonstrating knowledge of gardening. Mary also helps her sickly cousin Colin recover from his fears and illness by talking to him confidently, in parallel with her own development into a wise young girl.