No, she should be punished under UK laws and then deported —> under British law she should be punished in the UK as this was a crime under British laws.
Furthermore, I think she would also be prosecuted under INDIAN laws for crimes committed abroad.
I just googled and saw that India exercises extra-territorial jurisdiction over its citizens under Section 4 of the Indian Penal Code (IPC) (and the updated Bharatiya Nyaya Sanhita, BNS) —> so if an Indian citizen commits an act abroad that constitutes a crime under Indian law, Indian courts possess the legal authority to prosecute them as if the crime had happened inside India.
so if the Brits don’t punish her, India will
That’s fascinating and I didn’t know this about the Indian system