From Nookipedia, the Animal Crossing wiki
Maelle, pronounced "My-Ell" (アンヌ, Anne), is a snooty duck in the Animal Crossing series. In Dōbutsu no Mori +, Animal Crossing and Dōbutsu no Mori e+, she is an islander. She reappears in Animal Crossing: Wild World and Animal Crossing: City Folk, where she is a villager. The name, "Maelle" means "ambitious", a trait known among snooty villagers who wish to become famous or rich. Her initial phrase, "duckling", reflects on her species. Her picture quote may relate to when she lived on the island.
Maelle is a yellow duck with a bright red beak and webbed-feet. She wears green eyeshadow and maintains a lazy eyed expression. In Animal Crossing she wears a red aloha shirt, like other female islanders. In Animal Crossing: Wild World and Animal Crossing: City Folk, she wears a heart shirt.
Below is a brief description of the snooty personality. For more information, click here.
Maelle has a snooty personality, which means she will appear arrogant and snobbish towards the player and other villagers. She is very rude. But will appear friendly and nice in some discussions, provided they are mature and do not insult her lifestyle. She finds appearance important, and will get angry or upset if someone criticizes her sense of style or fitness, which means a conversation between her a jock personality may leave either one upset or angry. Her attitude towards the player changes, as she begins to warm up to them, but she will still retain some arrogance and subtle rudeness. She may not get on with lazy villagers, due to their lifestyles - lazy villagers having a strong interest in food or relaxing of which will make her uncomfortable, angry or upset when in conversation. She will upset peppy villagers, usually by gossiping about them, and finding small things to judge them on. She will get along well with normal, cranky, and other snooty villagers. When you add a friend code or have a friend over and Maelle learns about you, whether she is in your town or not, she will tell everyone mean and silly rumors about you, calling you a "bell pincher" or "broke joker" in some cases.
The music that is playing in her house is called "Café K.K." She also has pink wallpaper, ceramic tile flooring, a parrot, a lovely kitchen and bed, and a cream sofa. In Animal Crossing: Wild World, she has a petal parasol, a grassy shirt, a cream sofa, a lovely kitchen, a classic buffet, a parrot, a red quinoa and a pink grid shirt.
 Fruit Allergy
As an islander, she has a favorite fruit and a fruit that she is allergic to. Feeding her the allergy fruit will reduce the likelihood of her dropping money bags. Maelle loves apples and is allergic to oranges.