Wearing a red dress the new Kumari, or living goddess, Trishna Shakya was taken from her home to the ancient Durbar Square for a short initiation ceremony.
Her father then carried her across the cobbled square -- which still bears the scars of a powerful earthquake that hit in 2015 -- to the temple-palace where she will live under the care of specially-appointed guardians.'
"I have mixed feelings. My daughter has become the Kumari and it is a good thing. But there is also sadness because she will be separated from us," her father Bijaya Ratna Shakya told AFP.
Shakya leaves behind a twin brother, Krishna, who cried as his sister was taken from the family home.
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As the Kumari, Shakya is considered the embodiment of the Hindu goddess Taleju and will only be allowed to leave the temple 13 times a year on special feast days.
Historically, 108 buffalo, goats, chickens, ducks and eggs were slaughtered as part of the ritual -- a number considered auspicious in Hinduism -- but the number has been scaled back under pressure from animal rights activists.
The tradition of the Kumari, meaning princess in Sanskrit, comes from the Newar community indigenous to the Kathmandu Valley.
It blends elements of Hinduism and Buddhism and the most important Kumaris represent each of the three former royal kingdoms of the valley: Kathmandu, Patan and Bhaktapur.
Selection criteria for aspiring Kumaris is strict and includes a number of specific physical attributes such as an unblemished body, a chest like a lion and thighs like a deer.
Even if a girl fulfils all the physical requirements, she must then prove her bravery by not crying at the sight of a sacrificed buffalo.
The tradition has drawn criticism from child rights activists who say the Kumaris are denied a childhood and their isolation from society hinders their education and development.
Many former Kumaris have spoken about the struggles they face reintegrating into society after they are dethroned.
The outgoing Kumari, Matine Shakya, 12, left the temple- palace via a side door shortly after the younger girl arrived to take the throne.
Matine still wore the red Kumari makeup, which includes a 'third-eye' painted on her forehead, and the ornate robes of the goddess.
The 12-year-old was carried on a sedan chair back to her family's home, which she left aged three in 2008 when she was anointed as the Kumari.