She must've hung out w/ Nepalese during a majority of her time in the UK. Else, it's pretty surprising for a girl in particular to have a Nepali accent, despite having moved to the UK at the age of 15 to still have a Nepali accent. 

In the event that she was crowned Miss World, you've gotta wonder if Nepalese govt. will declare a 3-day national holiday to commemorate her win. I wouldn't be too surprised if that happened.