A person, usually a teenager or young adult who does not and can not comply with modern society, who is highly evolved spiritually and is believed to have come here in this time to aid in the transition of the energies of earth in the near future. They tend to be androgynous and have psychic powers, such as clairvoyancy. The youngest are Crystal Children
which are about seven and under, but can be older.
She has an Indigo aura, so she must be an Indigo Child.