How did this woman sneak out of the country?

THE father of an autistic woman who secretly got a new passport and followed her boyfriend to northern India is demanding to know how she managed to sneak out of New Zealand. Christchurch broker Craig Doody wants a police investigation into how Jessica Doody, a 24-year-old with the mental capacity of a young teen, managed to change her name and leave the country without him knowing.

How did this woman sneak out of the country?