If some strange things had happened: her rental car was not where she left it - it was low on fuel when she had left plenty in it - for example - then she might describe the strange things as part of a game - a psychological experiment - she may have waited for pranksters to pop up saying she had been pranked and when they didn't, may then have attributed what she knew was an altered scenario - to a psych game and been trying to explain this to her parents at home; this may have flipped her a bit if the strange things were such that she worried about catching her flight or being deliberately delayed; she may have perceived the strange events as not simply a game but also some level of threat.