A "Mahendi Girl" might refer to a girl who has applied mehndi,

Mehndi is a form of body art that originated in ancient India and is still popular today, especially among women. It involves the application of henna paste to the skin in intricate designs, which are then allowed to dry and stain the skin. The resulting design is a beautiful and temporary form of body decoration that can be applied to the hands, arms, and feet. The art of mehndi is often associated with special occasions, such as weddings, festivals, and religious ceremonies, and is often seen as a way to celebrate and honor these occasions. Many people find the process of applying mehndi to be relaxing and enjoyable, and the resulting designs are often seen as a symbol of beauty and femininity.