'From here' is a bit of an open ended question, which she prefers. It allows her some grace on the question 'are you from London?' She could navigate a narrative with that freedom, not having to rely on him knowing anything else about her.

"No. This is my first island." She'll take the chance and assume he's a traveler too, given all he's asked. At least for now, there's a measure of honesty. "I didn't expect such a strange welcome."