The character I'm asking about is a recent immigrant from either the UK, Australia, or New Zealand (to be decided later, possibly dependent on casting).
What swear words or exclamations would a relatively polite, well-bred, "good girl" type 16-year-old girl from any or all of those places use, under approximately the following situations:
1. Her cell phone has no reception (mild surprise/disappointment)
2. Demons are chasing, and occasionally eating, members of the party (the rest of the movie--extreme distress, surprise, horror, shock, et cetera)
(please identify which of those places the words or phrases you suggest would be used, too, so I don't have a Brit speaking like an Aussie, or whatever)